HVAC Error Codes & Troubleshooting GuideUnion County, New Jersey

Complete error code directory for all major HVAC brands serving Elizabeth, Westfield, Summit, and all Union County municipalities

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Complete HVAC Error Codes Directory

Comprehensive troubleshooting guide for all major HVAC brands found in Union County homes and businesses

Carrier Error Codes

Industry leader with advanced diagnostics

Error Code: 11

High Pressure Switch Open

Common Causes
  • Dirty outdoor coil
  • Blocked condenser
  • Overcharged system
  • Bad high pressure switch
Safe DIY Checks
  • Clean outdoor unit
  • Check for debris around condenser
Call Professional For

Refrigerant issues, electrical problems, or persistent high pressure

Call (908) 249-9701
Error Code: 12

Low Pressure Switch Open

Common Causes
  • Low refrigerant
  • Dirty evaporator coil
  • Blocked filter
  • Bad low pressure switch
Safe DIY Checks
  • Replace air filter
  • Check for ice on indoor coil
Call Professional For

Refrigerant leaks, coil cleaning, or pressure switch replacement

Call (908) 249-9701
Error Code: 13

Outdoor Temperature Sensor Error

Common Causes
  • Faulty outdoor sensor
  • Wiring issues
  • Sensor disconnected
Safe DIY Checks
  • Check sensor connections
Call Professional For

Sensor replacement or wiring repairs

Call (908) 249-9701
Error Code: 14

Indoor Temperature Sensor Error

Common Causes
  • Bad indoor sensor
  • Loose wiring
  • Sensor out of range
Safe DIY Checks
  • Check thermostat placement
Call Professional For

Sensor replacement or control board issues

Call (908) 249-9701
Error Code: 21

Indoor Blower Motor Issue

Common Causes
  • Motor failure
  • Capacitor problems
  • Blocked airflow
Safe DIY Checks
  • Check for obstructions
  • Verify power to unit
Call Professional For

Motor replacement, capacitor issues, or electrical problems

Call (908) 249-9701
Error Code: 23

Compressor Contactor Issue

Common Causes
  • Bad contactor
  • Electrical problems
  • Control board failure
Safe DIY Checks
  • Check circuit breakers
Call Professional For

Electrical repairs and contactor replacement

Call (908) 249-9701
Error Code: 24

Indoor Coil Temperature Sensor

Common Causes
  • Faulty coil sensor
  • Wiring problems
  • Ice formation
Safe DIY Checks
  • Check for ice on coil
  • Ensure good airflow
Call Professional For

Sensor replacement or refrigerant issues

Call (908) 249-9701
Error Code: 31

High Pressure Lockout

Common Causes
  • System overcharged
  • Dirty condenser
  • Bad expansion valve
Safe DIY Checks
  • Clean outdoor unit thoroughly
Call Professional For

Refrigerant adjustment or component replacement

Call (908) 249-9701
Error Code: 32

Low Pressure Lockout

Common Causes
  • Refrigerant leak
  • Blocked evaporator
  • Expansion valve issue
Safe DIY Checks
  • Replace filter
  • Check indoor vents
Call Professional For

Leak repair or refrigerant recharge

Call (908) 249-9701
Error Code: 33

Compressor Motor Issue

Common Causes
  • Motor overheating
  • Electrical problems
  • Internal failure
Safe DIY Checks
  • Ensure adequate clearance around unit
Call Professional For

Compressor replacement or electrical repairs

Call (908) 249-9701
Error Code: 41

Outdoor Fan Motor Problem

Common Causes
  • Motor failure
  • Capacitor bad
  • Wiring issues
Safe DIY Checks
  • Check for debris in fan
Call Professional For

Motor or capacitor replacement

Call (908) 249-9701
Error Code: 42

Control Board Communication Error

Common Causes
  • Board failure
  • Wiring problems
  • Power issues
Safe DIY Checks
  • Check power connections
Call Professional For

Control board replacement

Call (908) 249-9701
Error Code: 43

Flame Sensor Error (Gas Units)

Common Causes
  • Dirty flame sensor
  • Bad sensor
  • Gas supply issues
Safe DIY Checks
  • Visual inspection only
Call Professional For

Gas system requires professional service

Call (908) 249-9701
Error Code: 51

Reversing Valve Problem (Heat Pumps)

Common Causes
  • Valve stuck
  • Solenoid failure
  • Refrigerant issues
Safe DIY Checks
  • None - refrigerant system
Call Professional For

Valve replacement or refrigerant work

Call (908) 249-9701
Error Code: 52

Auxiliary Heat Lockout

Common Causes
  • Electric heat issues
  • Safety switch open
  • Overheating
Safe DIY Checks
  • Check circuit breakers
Call Professional For

Electric heating element service

Call (908) 249-9701
Error Code: 61

Indoor Motor Current Error

Common Causes
  • Motor drawing too much current
  • Blocked airflow
  • Motor failure
Safe DIY Checks
  • Check filter and vents
Call Professional For

Motor replacement or electrical issues

Call (908) 249-9701
Error Code: 62

Outdoor Unit Communication Lost

Common Causes
  • Wiring problems
  • Control board issues
  • Power problems
Safe DIY Checks
  • Check circuit breakers
Call Professional For

Wiring or control board replacement

Call (908) 249-9701
Error Code: 71

Memory Error

Common Causes
  • Control board failure
  • Power surge damage
  • Age-related failure
Safe DIY Checks
  • Power cycle the system
Call Professional For

Control board replacement

Call (908) 249-9701
Error Code: 81

Indoor Airflow Issue

Common Causes
  • Dirty filter
  • Blocked vents
  • Ductwork problems
Safe DIY Checks
  • Replace filter
  • Open all vents
Call Professional For

Ductwork inspection or motor issues

Call (908) 249-9701
Error Code: 91

System Lockout

Common Causes
  • Multiple faults
  • Safety shutdown
  • Control issues
Safe DIY Checks
  • Power cycle after clearing other issues
Call Professional For

Complete system diagnosis

Call (908) 249-9701

Trane Error Codes

Reliable systems with clear error reporting

Error Code: E0

Communication Error

Common Causes
  • Wiring problems
  • Control board failure
  • Power issues
Safe DIY Checks
  • Check all electrical connections
Call Professional For

Wiring repairs or board replacement

Call (908) 249-9701
Error Code: E1

Indoor Temperature Sensor

Common Causes
  • Sensor failure
  • Loose connections
  • Out of range reading
Safe DIY Checks
  • Check thermostat location
Call Professional For

Sensor replacement

Call (908) 249-9701
Error Code: E2

Outdoor Temperature Sensor

Common Causes
  • Bad outdoor sensor
  • Weather damage
  • Wiring issues
Safe DIY Checks
  • Visual inspection of outdoor unit
Call Professional For

Sensor replacement

Call (908) 249-9701
Error Code: E3

Indoor Coil Sensor Error

Common Causes
  • Coil sensor failure
  • Ice on coil
  • Poor airflow
Safe DIY Checks
  • Check air filter
  • Ensure vents open
Call Professional For

Sensor replacement or coil service

Call (908) 249-9701
Error Code: E4

Outdoor Coil Sensor Error

Common Causes
  • Outdoor coil sensor bad
  • Dirty condenser
  • Sensor damage
Safe DIY Checks
  • Clean around outdoor unit
Call Professional For

Sensor replacement

Call (908) 249-9701
Error Code: E5

Indoor Blower Motor Error

Common Causes
  • Motor failure
  • Capacitor problems
  • Airflow restriction
Safe DIY Checks
  • Check for blockages
Call Professional For

Motor or capacitor replacement

Call (908) 249-9701
Error Code: E6

Outdoor Fan Motor Error

Common Causes
  • Fan motor failure
  • Bad capacitor
  • Obstruction
Safe DIY Checks
  • Remove debris from fan area
Call Professional For

Motor replacement

Call (908) 249-9701
Error Code: E7

Compressor Error

Common Causes
  • Compressor failure
  • Electrical issues
  • Overheating
Safe DIY Checks
  • Ensure unit has proper clearance
Call Professional For

Compressor service or replacement

Call (908) 249-9701
Error Code: E8

High Pressure Switch

Common Causes
  • System overcharged
  • Dirty condenser
  • Bad switch
Safe DIY Checks
  • Clean outdoor coil
Call Professional For

Refrigerant service

Call (908) 249-9701
Error Code: E9

Low Pressure Switch

Common Causes
  • Low refrigerant
  • Restriction
  • Bad switch
Safe DIY Checks
  • Check air filter
Call Professional For

Refrigerant leak repair

Call (908) 249-9701
Error Code: F0

Flame Sensor (Gas Units)

Common Causes
  • Dirty sensor
  • Bad sensor
  • Gas pressure issues
Safe DIY Checks
  • None - gas system
Call Professional For

Gas system service required

Call (908) 249-9701
Error Code: F1

Ignition Failure

Common Causes
  • Igniter problems
  • Gas supply issues
  • Control problems
Safe DIY Checks
  • Check gas supply is on
Call Professional For

Gas system diagnosis

Call (908) 249-9701
Error Code: F2

Limit Switch Open

Common Causes
  • Overheating
  • Airflow problems
  • Bad limit switch
Safe DIY Checks
  • Check air filter
Call Professional For

Safety control replacement

Call (908) 249-9701
Error Code: F3

Pressure Switch Error

Common Causes
  • Venting problems
  • Blocked exhaust
  • Switch failure
Safe DIY Checks
  • Check exhaust vent for obstructions
Call Professional For

Venting or pressure switch service

Call (908) 249-9701
Error Code: F4

Auxiliary Heat Error

Common Causes
  • Electric heat failure
  • Breaker tripped
  • Element burned out
Safe DIY Checks
  • Check circuit breakers
Call Professional For

Electric heat repair

Call (908) 249-9701
Error Code: F5

Reversing Valve (Heat Pumps)

Common Causes
  • Valve stuck
  • Solenoid failure
  • Refrigerant problems
Safe DIY Checks
  • None - refrigerant system
Call Professional For

Heat pump service

Call (908) 249-9701
Error Code: F6

Defrost Control Error

Common Causes
  • Defrost board failure
  • Sensor problems
  • Timer issues
Safe DIY Checks
  • None - complex control system
Call Professional For

Defrost system service

Call (908) 249-9701
Error Code: F7

Memory Error

Common Causes
  • Control board problems
  • Power surge
  • Programming lost
Safe DIY Checks
  • Power cycle the system
Call Professional For

Control board service

Call (908) 249-9701
Error Code: F8

Airflow Error

Common Causes
  • Blocked filter
  • Closed vents
  • Ductwork issues
Safe DIY Checks
  • Replace filter
  • Open all vents
Call Professional For

Ductwork or blower service

Call (908) 249-9701
Error Code: F9

System Lockout

Common Causes
  • Multiple faults
  • Safety shutdown
  • Control failure
Safe DIY Checks
  • Address other error codes first
Call Professional For

Complete system diagnosis

Call (908) 249-9701

Lennox Error Codes

Premium systems with detailed diagnostics

Error Code: 188

Communication Failure

Common Causes
  • Wiring problems
  • Control board issues
  • Power problems
Safe DIY Checks
  • Check electrical connections
Call Professional For

Communication system repair

Call (908) 249-9701
Error Code: 189

Indoor Temperature Sensor

Common Causes
  • Sensor failure
  • Wiring issues
  • Control board problems
Safe DIY Checks
  • Check thermostat operation
Call Professional For

Sensor or control replacement

Call (908) 249-9701
Error Code: 190

Outdoor Temperature Sensor

Common Causes
  • Bad outdoor sensor
  • Environmental damage
  • Wiring
Safe DIY Checks
  • Visual inspection
Call Professional For

Outdoor sensor replacement

Call (908) 249-9701
Error Code: 191

Indoor Coil Temperature

Common Causes
  • Coil sensor bad
  • Ice formation
  • Airflow issues
Safe DIY Checks
  • Check for ice
  • Replace air filter
Call Professional For

Coil sensor service

Call (908) 249-9701
Error Code: 192

Outdoor Coil Temperature

Common Causes
  • Outdoor coil sensor failure
  • Dirty coil
  • Damage
Safe DIY Checks
  • Clean outdoor unit
Call Professional For

Sensor replacement

Call (908) 249-9701
Error Code: 193

Compressor Discharge Temperature

Common Causes
  • Overheating compressor
  • Low refrigerant
  • Bad sensor
Safe DIY Checks
  • Ensure proper airflow
Call Professional For

Compressor service

Call (908) 249-9701
Error Code: 194

High Pressure Switch

Common Causes
  • Overcharged system
  • Dirty condenser
  • Switch failure
Safe DIY Checks
  • Clean outdoor coil
Call Professional For

Refrigerant service

Call (908) 249-9701
Error Code: 195

Low Pressure Switch

Common Causes
  • Low refrigerant
  • Blockage
  • Switch problems
Safe DIY Checks
  • Check air filter
Call Professional For

Leak repair

Call (908) 249-9701
Error Code: 196

Indoor Blower Motor

Common Causes
  • Motor failure
  • Capacitor bad
  • Control issues
Safe DIY Checks
  • Check for obstructions
Call Professional For

Motor replacement

Call (908) 249-9701
Error Code: 197

Outdoor Fan Motor

Common Causes
  • Fan motor failure
  • Capacitor issues
  • Wiring
Safe DIY Checks
  • Remove debris
Call Professional For

Motor service

Call (908) 249-9701
Error Code: 198

Compressor Contactor

Common Causes
  • Bad contactor
  • Electrical problems
  • Control failure
Safe DIY Checks
  • Check breakers
Call Professional For

Electrical repair

Call (908) 249-9701
Error Code: 199

Reversing Valve (Heat Pumps)

Common Causes
  • Valve stuck
  • Solenoid bad
  • Control problems
Safe DIY Checks
  • None - refrigerant system
Call Professional For

Heat pump service

Call (908) 249-9701
Error Code: 221

Flame Sensor (Gas)

Common Causes
  • Dirty sensor
  • Sensor failure
  • Gas issues
Safe DIY Checks
  • None - gas system
Call Professional For

Gas system service

Call (908) 249-9701
Error Code: 222

Ignition Failure

Common Causes
  • Igniter problems
  • Gas pressure
  • Control issues
Safe DIY Checks
  • Verify gas supply
Call Professional For

Ignition system repair

Call (908) 249-9701
Error Code: 223

Limit Switch

Common Causes
  • Overheating
  • Poor airflow
  • Switch failure
Safe DIY Checks
  • Check air filter
Call Professional For

Safety control service

Call (908) 249-9701
Error Code: 224

Pressure Switch

Common Causes
  • Venting issues
  • Blockage
  • Switch problems
Safe DIY Checks
  • Check exhaust venting
Call Professional For

Venting service

Call (908) 249-9701
Error Code: 225

Auxiliary Heat

Common Causes
  • Electric heat failure
  • Breaker off
  • Element bad
Safe DIY Checks
  • Check circuit breakers
Call Professional For

Electric heat repair

Call (908) 249-9701
Error Code: 226

Defrost Control

Common Causes
  • Control failure
  • Sensor issues
  • Timer problems
Safe DIY Checks
  • None - complex system
Call Professional For

Defrost system service

Call (908) 249-9701
Error Code: 227

Memory Error

Common Causes
  • Board failure
  • Power issues
  • Programming lost
Safe DIY Checks
  • Power cycle system
Call Professional For

Control board replacement

Call (908) 249-9701
Error Code: 228

System Lockout

Common Causes
  • Multiple errors
  • Safety lockout
  • Control problems
Safe DIY Checks
  • Clear other error codes
Call Professional For

Complete diagnosis

Call (908) 249-9701

Rheem Error Codes

Efficient systems with user-friendly codes

Error Code: 11

No Heating Call

Common Causes
  • Thermostat issues
  • Wiring problems
  • Control board
Safe DIY Checks
  • Check thermostat settings
  • Verify power
Call Professional For

Thermostat or control issues

Call (908) 249-9701
Error Code: 12

No Cooling Call

Common Causes
  • Thermostat problems
  • Wiring issues
  • Control failure
Safe DIY Checks
  • Check cooling settings
  • Verify connections
Call Professional For

Control system repair

Call (908) 249-9701
Error Code: 13

Limit Switch Open

Common Causes
  • Overheating
  • Poor airflow
  • Bad switch
Safe DIY Checks
  • Replace air filter
  • Check vents
Call Professional For

Airflow or safety control service

Call (908) 249-9701
Error Code: 14

High Pressure Switch

Common Causes
  • Dirty condenser
  • Overcharged system
  • Bad switch
Safe DIY Checks
  • Clean outdoor unit
Call Professional For

Refrigerant service

Call (908) 249-9701
Error Code: 21

Gas Valve Error

Common Causes
  • Gas valve failure
  • Electrical issues
  • Control problems
Safe DIY Checks
  • Check gas supply
Call Professional For

Gas system service

Call (908) 249-9701
Error Code: 22

Low Pressure Switch

Common Causes
  • Low refrigerant
  • Blockage
  • Switch failure
Safe DIY Checks
  • Check air filter
Call Professional For

Refrigerant leak repair

Call (908) 249-9701
Error Code: 23

Rollout Switch Open

Common Causes
  • Overheating
  • Venting problems
  • Gas pressure
Safe DIY Checks
  • Check exhaust venting
Call Professional For

Gas system diagnosis

Call (908) 249-9701
Error Code: 24

Auxiliary Heat Issue

Common Causes
  • Electric heat problems
  • Breaker off
  • Element failure
Safe DIY Checks
  • Check breakers
Call Professional For

Electric heat service

Call (908) 249-9701
Error Code: 31

Pressure Switch Error

Common Causes
  • Venting issues
  • Switch failure
  • Blockage
Safe DIY Checks
  • Inspect exhaust vent
Call Professional For

Venting or switch service

Call (908) 249-9701
Error Code: 32

Ignition Failure

Common Causes
  • Igniter problems
  • Gas issues
  • Control failure
Safe DIY Checks
  • Verify gas is on
Call Professional For

Ignition system repair

Call (908) 249-9701
Error Code: 33

Flame Sensor

Common Causes
  • Dirty sensor
  • Sensor failure
  • Wiring issues
Safe DIY Checks
  • None - gas system
Call Professional For

Flame sensor service

Call (908) 249-9701
Error Code: 34

Blower Motor Error

Common Causes
  • Motor failure
  • Capacitor bad
  • Airflow restriction
Safe DIY Checks
  • Check for blockages
Call Professional For

Motor replacement

Call (908) 249-9701
Error Code: 41

Indoor Temperature Sensor

Common Causes
  • Sensor failure
  • Wiring problems
  • Control issues
Safe DIY Checks
  • Check thermostat
Call Professional For

Sensor replacement

Call (908) 249-9701
Error Code: 42

Outdoor Temperature Sensor

Common Causes
  • Bad outdoor sensor
  • Weather damage
  • Wiring
Safe DIY Checks
  • Visual inspection
Call Professional For

Outdoor sensor service

Call (908) 249-9701
Error Code: 43

Reversing Valve

Common Causes
  • Valve stuck
  • Solenoid failure
  • Control problems
Safe DIY Checks
  • None - refrigerant system
Call Professional For

Heat pump service

Call (908) 249-9701
Error Code: 44

Defrost Control

Common Causes
  • Control board failure
  • Sensor problems
  • Timer issues
Safe DIY Checks
  • None - complex system
Call Professional For

Defrost system service

Call (908) 249-9701
Error Code: 51

Communication Error

Common Causes
  • Wiring problems
  • Control board failure
  • Power issues
Safe DIY Checks
  • Check connections
Call Professional For

Communication repair

Call (908) 249-9701
Error Code: 52

Memory Error

Common Causes
  • Board failure
  • Power surge
  • Age-related failure
Safe DIY Checks
  • Power cycle system
Call Professional For

Control board replacement

Call (908) 249-9701
Error Code: 61

Compressor Issue

Common Causes
  • Compressor failure
  • Electrical problems
  • Overheating
Safe DIY Checks
  • Ensure proper clearance
Call Professional For

Compressor service

Call (908) 249-9701
Error Code: 62

System Lockout

Common Causes
  • Multiple faults
  • Safety shutdown
  • Control failure
Safe DIY Checks
  • Clear other codes first
Call Professional For

Complete system diagnosis

Call (908) 249-9701

Goodman Error Codes

Affordable reliable systems with clear codes

Error Code: E0

EEPROM Error

Common Causes
  • Control board failure
  • Memory corruption
  • Power surge
Safe DIY Checks
  • Power cycle the system
Call Professional For

Control board replacement

Call (908) 249-9701
Error Code: E1

High Pressure Switch

Common Causes
  • Dirty outdoor coil
  • Overcharged system
  • Bad switch
Safe DIY Checks
  • Clean condenser coil
Call Professional For

Refrigerant service

Call (908) 249-9701
Error Code: E2

Low Pressure Switch

Common Causes
  • Low refrigerant
  • Dirty filter
  • Blockage
Safe DIY Checks
  • Replace air filter
Call Professional For

Leak repair

Call (908) 249-9701
Error Code: E3

Open Temperature Sensor

Common Causes
  • Sensor failure
  • Loose wiring
  • Damage
Safe DIY Checks
  • Check sensor connections
Call Professional For

Sensor replacement

Call (908) 249-9701
Error Code: E4

Shorted Temperature Sensor

Common Causes
  • Sensor shorted
  • Wiring damage
  • Water intrusion
Safe DIY Checks
  • Check for water damage
Call Professional For

Sensor and wiring service

Call (908) 249-9701
Error Code: E5

Open Coil Sensor

Common Causes
  • Coil sensor failure
  • Wiring problems
  • Corrosion
Safe DIY Checks
  • Visual inspection
Call Professional For

Coil sensor replacement

Call (908) 249-9701
Error Code: E6

Shorted Coil Sensor

Common Causes
  • Sensor shorted
  • Moisture damage
  • Wiring issues
Safe DIY Checks
  • Check for moisture
Call Professional For

Sensor service

Call (908) 249-9701
Error Code: E7

Open Outdoor Sensor

Common Causes
  • Outdoor sensor failure
  • Weather damage
  • Disconnected
Safe DIY Checks
  • Check outdoor sensor
Call Professional For

Outdoor sensor replacement

Call (908) 249-9701
Error Code: E8

Shorted Outdoor Sensor

Common Causes
  • Sensor damage
  • Water intrusion
  • Wiring fault
Safe DIY Checks
  • Inspect for water damage
Call Professional For

Sensor and wiring repair

Call (908) 249-9701
Error Code: F0

Indoor Blower Off

Common Causes
  • Motor failure
  • Control issues
  • Power problems
Safe DIY Checks
  • Check circuit breakers
Call Professional For

Blower motor service

Call (908) 249-9701
Error Code: F1

Reversing Valve

Common Causes
  • Valve stuck
  • Solenoid failure
  • Control problems
Safe DIY Checks
  • None - refrigerant system
Call Professional For

Heat pump service

Call (908) 249-9701
Error Code: F2

Outdoor Unit Off

Common Causes
  • Power issues
  • Control failure
  • Safety lockout
Safe DIY Checks
  • Check outdoor breaker
Call Professional For

Outdoor unit diagnosis

Call (908) 249-9701
Error Code: F3

Malfunction or No Call

Common Causes
  • Thermostat issues
  • Wiring problems
  • Control failure
Safe DIY Checks
  • Check thermostat settings
Call Professional For

Control system service

Call (908) 249-9701
Error Code: F4

Open Fuse

Common Causes
  • Blown fuse
  • Electrical overload
  • Short circuit
Safe DIY Checks
  • Check and replace fuses
Call Professional For

Electrical diagnosis

Call (908) 249-9701
Error Code: F5

Outdoor Coil Sensor

Common Causes
  • Coil sensor failure
  • Wiring issues
  • Environmental damage
Safe DIY Checks
  • Visual inspection
Call Professional For

Outdoor coil sensor service

Call (908) 249-9701
Error Code: P0

Transducer Fault

Common Causes
  • Pressure transducer failure
  • Wiring problems
  • Control issues
Safe DIY Checks
  • None - complex system
Call Professional For

Pressure control service

Call (908) 249-9701
Error Code: P1

High Pressure Fault

Common Causes
  • System overcharged
  • Dirty coil
  • Restriction
Safe DIY Checks
  • Clean outdoor coil
Call Professional For

Refrigerant service

Call (908) 249-9701
Error Code: P2

Low Pressure Fault

Common Causes
  • Refrigerant leak
  • Blockage
  • Low charge
Safe DIY Checks
  • Check air filter
Call Professional For

Leak detection and repair

Call (908) 249-9701
Error Code: rE

Reverse Polarity

Common Causes
  • Incorrect wiring
  • Installation error
  • Power issues
Safe DIY Checks
  • None - electrical safety
Call Professional For

Electrical wiring correction

Call (908) 249-9701
Error Code: rtF

Sensor Fault

Common Causes
  • Multiple sensor issues
  • Control problems
  • Wiring fault
Safe DIY Checks
  • Power cycle system
Call Professional For

Complete sensor diagnosis

Call (908) 249-9701

York Error Codes

Dependable systems with comprehensive diagnostics

Error Code: 01

Low Pressure Switch

Common Causes
  • Low refrigerant
  • Dirty evaporator
  • Blockage
Safe DIY Checks
  • Replace air filter
  • Check indoor vents
Call Professional For

Refrigerant leak repair

Call (908) 249-9701
Error Code: 02

High Pressure Switch

Common Causes
  • Dirty condenser
  • Overcharged system
  • Bad switch
Safe DIY Checks
  • Clean outdoor unit
Call Professional For

Refrigerant service

Call (908) 249-9701
Error Code: 03

Low Pressure Transducer

Common Causes
  • Transducer failure
  • Low refrigerant
  • Wiring issues
Safe DIY Checks
  • None - complex system
Call Professional For

Pressure control service

Call (908) 249-9701
Error Code: 04

High Pressure Transducer

Common Causes
  • Transducer bad
  • High pressure
  • Control problems
Safe DIY Checks
  • Clean condenser
Call Professional For

Pressure system service

Call (908) 249-9701
Error Code: 05

Outdoor Coil Temperature

Common Causes
  • Coil sensor failure
  • Wiring problems
  • Environmental
Safe DIY Checks
  • Check outdoor coil
Call Professional For

Coil sensor replacement

Call (908) 249-9701
Error Code: 06

Indoor Coil Temperature

Common Causes
  • Indoor coil sensor bad
  • Ice formation
  • Airflow issues
Safe DIY Checks
  • Check for ice
  • Replace filter
Call Professional For

Indoor coil service

Call (908) 249-9701
Error Code: 07

Outdoor Temperature Sensor

Common Causes
  • Outdoor sensor failure
  • Weather damage
  • Wiring
Safe DIY Checks
  • Visual inspection
Call Professional For

Outdoor sensor replacement

Call (908) 249-9701
Error Code: 08

Indoor Temperature Sensor

Common Causes
  • Indoor sensor bad
  • Thermostat issues
  • Wiring problems
Safe DIY Checks
  • Check thermostat
Call Professional For

Temperature sensor service

Call (908) 249-9701
Error Code: 09

Discharge Temperature Sensor

Common Causes
  • Compressor sensor bad
  • Overheating
  • Wiring fault
Safe DIY Checks
  • Ensure proper airflow
Call Professional For

Compressor sensor service

Call (908) 249-9701
Error Code: 10

Defrost Temperature Sensor

Common Causes
  • Defrost sensor failure
  • Ice buildup
  • Control issues
Safe DIY Checks
  • None - complex defrost system
Call Professional For

Defrost system service

Call (908) 249-9701
Error Code: 11

Communication Error

Common Causes
  • Wiring problems
  • Control board failure
  • Power issues
Safe DIY Checks
  • Check electrical connections
Call Professional For

Communication system repair

Call (908) 249-9701
Error Code: 12

Indoor Blower Motor

Common Causes
  • Motor failure
  • Capacitor bad
  • Control problems
Safe DIY Checks
  • Check for obstructions
Call Professional For

Blower motor replacement

Call (908) 249-9701
Error Code: 13

Outdoor Fan Motor

Common Causes
  • Fan motor failure
  • Capacitor issues
  • Wiring problems
Safe DIY Checks
  • Remove debris from fan
Call Professional For

Outdoor fan service

Call (908) 249-9701
Error Code: 14

Compressor Contactor

Common Causes
  • Bad contactor
  • Electrical issues
  • Control failure
Safe DIY Checks
  • Check circuit breakers
Call Professional For

Electrical contactor service

Call (908) 249-9701
Error Code: 15

Reversing Valve

Common Causes
  • Valve stuck
  • Solenoid bad
  • Control problems
Safe DIY Checks
  • None - refrigerant system
Call Professional For

Heat pump reversing valve service

Call (908) 249-9701
Error Code: 16

Auxiliary Heat

Common Causes
  • Electric heat failure
  • Breaker off
  • Element bad
Safe DIY Checks
  • Check circuit breakers
Call Professional For

Electric heat element service

Call (908) 249-9701
Error Code: 17

Memory Error

Common Causes
  • Control board failure
  • Power surge
  • Programming lost
Safe DIY Checks
  • Power cycle the system
Call Professional For

Control board replacement

Call (908) 249-9701
Error Code: 18

System Configuration Error

Common Causes
  • Setup problems
  • Incorrect settings
  • Control issues
Safe DIY Checks
  • None - requires programming
Call Professional For

System configuration service

Call (908) 249-9701
Error Code: 19

Airflow Error

Common Causes
  • Blocked filter
  • Closed vents
  • Ductwork problems
Safe DIY Checks
  • Replace filter
  • Open all vents
Call Professional For

Airflow system diagnosis

Call (908) 249-9701
Error Code: 20

System Lockout

Common Causes
  • Multiple faults
  • Safety shutdown
  • Control failure
Safe DIY Checks
  • Clear other error codes
Call Professional For

Complete system diagnosis

Call (908) 249-9701

Serving All Union County Communities

Professional HVAC error code diagnosis and repair throughout Union County's 21 municipalities

Elizabeth

24/7 HVAC error code diagnosis and emergency repair service

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Union

24/7 HVAC error code diagnosis and emergency repair service

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Westfield

24/7 HVAC error code diagnosis and emergency repair service

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Summit

24/7 HVAC error code diagnosis and emergency repair service

2-Hour Response Guarantee

Plainfield

24/7 HVAC error code diagnosis and emergency repair service

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Linden

24/7 HVAC error code diagnosis and emergency repair service

2-Hour Response Guarantee

Cranford

24/7 HVAC error code diagnosis and emergency repair service

2-Hour Response Guarantee

Clark

24/7 HVAC error code diagnosis and emergency repair service

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Scotch Plains

24/7 HVAC error code diagnosis and emergency repair service

2-Hour Response Guarantee

Roselle

24/7 HVAC error code diagnosis and emergency repair service

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Rahway

24/7 HVAC error code diagnosis and emergency repair service

2-Hour Response Guarantee

Berkeley Heights

24/7 HVAC error code diagnosis and emergency repair service

2-Hour Response Guarantee

New Providence

24/7 HVAC error code diagnosis and emergency repair service

2-Hour Response Guarantee

Garwood

24/7 HVAC error code diagnosis and emergency repair service

2-Hour Response Guarantee

Kenilworth

24/7 HVAC error code diagnosis and emergency repair service

2-Hour Response Guarantee

Mountainside

24/7 HVAC error code diagnosis and emergency repair service

2-Hour Response Guarantee

Roselle Park

24/7 HVAC error code diagnosis and emergency repair service

2-Hour Response Guarantee

Fanwood

24/7 HVAC error code diagnosis and emergency repair service

2-Hour Response Guarantee

Winfield

24/7 HVAC error code diagnosis and emergency repair service

2-Hour Response Guarantee

Springfield

24/7 HVAC error code diagnosis and emergency repair service

2-Hour Response Guarantee

Hillside

24/7 HVAC error code diagnosis and emergency repair service

2-Hour Response Guarantee

Why Union County Trusts Dimatic Control for HVAC Error Codes

Local Expertise

Union County technicians who understand local HVAC challenges

All Brands Certified

Factory-trained on Carrier, Trane, Lennox, Rheem, and more

Fully Stocked Vehicles

Common parts on hand for faster error code resolution

Rapid Response

2-hour emergency service throughout Union County

HVAC Troubleshooting Safety Guidelines for Union County Homeowners

Safe to Check Yourself

  • Replace air filters (turn system off first)
  • Check and reset circuit breakers
  • Verify thermostat settings and batteries
  • Clear debris from around outdoor unit
  • Check that all vents are open and unobstructed
  • Inspect exhaust vents for blockages (visual only)

Call Professional Immediately

  • Any work involving gas lines or connections
  • Electrical wiring or high-voltage components
  • Refrigerant leaks or charging issues
  • Compressor or motor replacements
  • Control board or sensor replacements
  • If you smell gas or suspect carbon monoxide

When in doubt, call Dimatic Control at (908) 249-9701

HVAC Error Code FAQs for Union County

What should I do when I see an error code on my HVAC system in Union County?

First, write down the exact error code and any symptoms. Check our comprehensive error code directory below for initial troubleshooting steps. If the issue requires professional attention or you're unsure about any repair, call Dimatic Control at (908) 249-9701. We provide 24/7 emergency service throughout Union County including Elizabeth, Westfield, Summit, and all 21 municipalities.

Are HVAC error codes the same for all brands like Carrier, Trane, and Lennox?

No, each HVAC manufacturer uses their own error code system. Carrier, Trane, Lennox, Rheem, Goodman, York, and other brands have unique codes. Our guide covers all major brands commonly found in Union County homes. Always check the specific brand section for accurate troubleshooting information.

Can I fix HVAC error codes myself in my Union County home?

Some error codes indicate simple issues like dirty filters or tripped breakers that homeowners can safely address. However, many codes require professional diagnosis and repair involving electrical components, refrigerant, or gas systems. Never attempt repairs involving gas lines, electrical work, or refrigerant. Call our Union County technicians for safety and warranty protection.

How quickly can you respond to HVAC emergencies in Union County?

Dimatic Control guarantees 2-hour emergency response throughout Union County. Our service vehicles are strategically located in Elizabeth, Union, and Westfield to quickly reach any municipality. Whether you're dealing with a heating emergency in Berkeley Heights or an AC failure in Cranford, we provide rapid professional service 24/7/365.

Do error codes always mean my HVAC system needs expensive repairs?

Not necessarily. Many error codes indicate minor issues like dirty filters, simple maintenance needs, or temporary sensor readings. Our troubleshooting guide helps you identify which issues are simple fixes versus those requiring professional attention. Dimatic Control always provides upfront estimates before any work begins, helping Union County residents make informed decisions.

Why do I keep getting the same error code on my Union County HVAC system?

Recurring error codes often indicate underlying issues like poor maintenance, aging components, or system compatibility problems. Union County's hard water, seasonal temperature extremes, and older home infrastructure can contribute to repeated problems. Our technicians specialize in finding root causes rather than temporary fixes, ensuring long-term reliability for your system.

HVAC Emergency in Union County?

Don't let error codes leave you without heating or cooling. Our certified technicians provide 24/7 emergency service with 2-hour response guarantee throughout Union County.

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