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
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) 249-9701Low 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) 249-9701Outdoor Temperature Sensor Error
Common Causes
- •Faulty outdoor sensor
- •Wiring issues
- •Sensor disconnected
Safe DIY Checks
- •Check sensor connections
Indoor Temperature Sensor Error
Common Causes
- •Bad indoor sensor
- •Loose wiring
- •Sensor out of range
Safe DIY Checks
- •Check thermostat placement
Indoor Blower Motor Issue
Common Causes
- •Motor failure
- •Capacitor problems
- •Blocked airflow
Safe DIY Checks
- •Check for obstructions
- •Verify power to unit
Compressor Contactor Issue
Common Causes
- •Bad contactor
- •Electrical problems
- •Control board failure
Safe DIY Checks
- •Check circuit breakers
Indoor Coil Temperature Sensor
Common Causes
- •Faulty coil sensor
- •Wiring problems
- •Ice formation
Safe DIY Checks
- •Check for ice on coil
- •Ensure good airflow
High Pressure Lockout
Common Causes
- •System overcharged
- •Dirty condenser
- •Bad expansion valve
Safe DIY Checks
- •Clean outdoor unit thoroughly
Low Pressure Lockout
Common Causes
- •Refrigerant leak
- •Blocked evaporator
- •Expansion valve issue
Safe DIY Checks
- •Replace filter
- •Check indoor vents
Compressor Motor Issue
Common Causes
- •Motor overheating
- •Electrical problems
- •Internal failure
Safe DIY Checks
- •Ensure adequate clearance around unit
Outdoor Fan Motor Problem
Common Causes
- •Motor failure
- •Capacitor bad
- •Wiring issues
Safe DIY Checks
- •Check for debris in fan
Control Board Communication Error
Common Causes
- •Board failure
- •Wiring problems
- •Power issues
Safe DIY Checks
- •Check power connections
Flame Sensor Error (Gas Units)
Common Causes
- •Dirty flame sensor
- •Bad sensor
- •Gas supply issues
Safe DIY Checks
- •Visual inspection only
Reversing Valve Problem (Heat Pumps)
Common Causes
- •Valve stuck
- •Solenoid failure
- •Refrigerant issues
Safe DIY Checks
- •None - refrigerant system
Auxiliary Heat Lockout
Common Causes
- •Electric heat issues
- •Safety switch open
- •Overheating
Safe DIY Checks
- •Check circuit breakers
Indoor Motor Current Error
Common Causes
- •Motor drawing too much current
- •Blocked airflow
- •Motor failure
Safe DIY Checks
- •Check filter and vents
Outdoor Unit Communication Lost
Common Causes
- •Wiring problems
- •Control board issues
- •Power problems
Safe DIY Checks
- •Check circuit breakers
Memory Error
Common Causes
- •Control board failure
- •Power surge damage
- •Age-related failure
Safe DIY Checks
- •Power cycle the system
Indoor Airflow Issue
Common Causes
- •Dirty filter
- •Blocked vents
- •Ductwork problems
Safe DIY Checks
- •Replace filter
- •Open all vents
System Lockout
Common Causes
- •Multiple faults
- •Safety shutdown
- •Control issues
Safe DIY Checks
- •Power cycle after clearing other issues
Trane Error Codes
Reliable systems with clear error reporting
Communication Error
Common Causes
- •Wiring problems
- •Control board failure
- •Power issues
Safe DIY Checks
- •Check all electrical connections
Indoor Temperature Sensor
Common Causes
- •Sensor failure
- •Loose connections
- •Out of range reading
Safe DIY Checks
- •Check thermostat location
Outdoor Temperature Sensor
Common Causes
- •Bad outdoor sensor
- •Weather damage
- •Wiring issues
Safe DIY Checks
- •Visual inspection of outdoor unit
Indoor Coil Sensor Error
Common Causes
- •Coil sensor failure
- •Ice on coil
- •Poor airflow
Safe DIY Checks
- •Check air filter
- •Ensure vents open
Outdoor Coil Sensor Error
Common Causes
- •Outdoor coil sensor bad
- •Dirty condenser
- •Sensor damage
Safe DIY Checks
- •Clean around outdoor unit
Indoor Blower Motor Error
Common Causes
- •Motor failure
- •Capacitor problems
- •Airflow restriction
Safe DIY Checks
- •Check for blockages
Outdoor Fan Motor Error
Common Causes
- •Fan motor failure
- •Bad capacitor
- •Obstruction
Safe DIY Checks
- •Remove debris from fan area
Compressor Error
Common Causes
- •Compressor failure
- •Electrical issues
- •Overheating
Safe DIY Checks
- •Ensure unit has proper clearance
High Pressure Switch
Common Causes
- •System overcharged
- •Dirty condenser
- •Bad switch
Safe DIY Checks
- •Clean outdoor coil
Low Pressure Switch
Common Causes
- •Low refrigerant
- •Restriction
- •Bad switch
Safe DIY Checks
- •Check air filter
Flame Sensor (Gas Units)
Common Causes
- •Dirty sensor
- •Bad sensor
- •Gas pressure issues
Safe DIY Checks
- •None - gas system
Ignition Failure
Common Causes
- •Igniter problems
- •Gas supply issues
- •Control problems
Safe DIY Checks
- •Check gas supply is on
Limit Switch Open
Common Causes
- •Overheating
- •Airflow problems
- •Bad limit switch
Safe DIY Checks
- •Check air filter
Pressure Switch Error
Common Causes
- •Venting problems
- •Blocked exhaust
- •Switch failure
Safe DIY Checks
- •Check exhaust vent for obstructions
Auxiliary Heat Error
Common Causes
- •Electric heat failure
- •Breaker tripped
- •Element burned out
Safe DIY Checks
- •Check circuit breakers
Reversing Valve (Heat Pumps)
Common Causes
- •Valve stuck
- •Solenoid failure
- •Refrigerant problems
Safe DIY Checks
- •None - refrigerant system
Defrost Control Error
Common Causes
- •Defrost board failure
- •Sensor problems
- •Timer issues
Safe DIY Checks
- •None - complex control system
Memory Error
Common Causes
- •Control board problems
- •Power surge
- •Programming lost
Safe DIY Checks
- •Power cycle the system
Airflow Error
Common Causes
- •Blocked filter
- •Closed vents
- •Ductwork issues
Safe DIY Checks
- •Replace filter
- •Open all vents
System Lockout
Common Causes
- •Multiple faults
- •Safety shutdown
- •Control failure
Safe DIY Checks
- •Address other error codes first
Lennox Error Codes
Premium systems with detailed diagnostics
Communication Failure
Common Causes
- •Wiring problems
- •Control board issues
- •Power problems
Safe DIY Checks
- •Check electrical connections
Indoor Temperature Sensor
Common Causes
- •Sensor failure
- •Wiring issues
- •Control board problems
Safe DIY Checks
- •Check thermostat operation
Outdoor Temperature Sensor
Common Causes
- •Bad outdoor sensor
- •Environmental damage
- •Wiring
Safe DIY Checks
- •Visual inspection
Indoor Coil Temperature
Common Causes
- •Coil sensor bad
- •Ice formation
- •Airflow issues
Safe DIY Checks
- •Check for ice
- •Replace air filter
Outdoor Coil Temperature
Common Causes
- •Outdoor coil sensor failure
- •Dirty coil
- •Damage
Safe DIY Checks
- •Clean outdoor unit
Compressor Discharge Temperature
Common Causes
- •Overheating compressor
- •Low refrigerant
- •Bad sensor
Safe DIY Checks
- •Ensure proper airflow
High Pressure Switch
Common Causes
- •Overcharged system
- •Dirty condenser
- •Switch failure
Safe DIY Checks
- •Clean outdoor coil
Low Pressure Switch
Common Causes
- •Low refrigerant
- •Blockage
- •Switch problems
Safe DIY Checks
- •Check air filter
Indoor Blower Motor
Common Causes
- •Motor failure
- •Capacitor bad
- •Control issues
Safe DIY Checks
- •Check for obstructions
Outdoor Fan Motor
Common Causes
- •Fan motor failure
- •Capacitor issues
- •Wiring
Safe DIY Checks
- •Remove debris
Compressor Contactor
Common Causes
- •Bad contactor
- •Electrical problems
- •Control failure
Safe DIY Checks
- •Check breakers
Reversing Valve (Heat Pumps)
Common Causes
- •Valve stuck
- •Solenoid bad
- •Control problems
Safe DIY Checks
- •None - refrigerant system
Flame Sensor (Gas)
Common Causes
- •Dirty sensor
- •Sensor failure
- •Gas issues
Safe DIY Checks
- •None - gas system
Ignition Failure
Common Causes
- •Igniter problems
- •Gas pressure
- •Control issues
Safe DIY Checks
- •Verify gas supply
Limit Switch
Common Causes
- •Overheating
- •Poor airflow
- •Switch failure
Safe DIY Checks
- •Check air filter
Pressure Switch
Common Causes
- •Venting issues
- •Blockage
- •Switch problems
Safe DIY Checks
- •Check exhaust venting
Auxiliary Heat
Common Causes
- •Electric heat failure
- •Breaker off
- •Element bad
Safe DIY Checks
- •Check circuit breakers
Defrost Control
Common Causes
- •Control failure
- •Sensor issues
- •Timer problems
Safe DIY Checks
- •None - complex system
Memory Error
Common Causes
- •Board failure
- •Power issues
- •Programming lost
Safe DIY Checks
- •Power cycle system
System Lockout
Common Causes
- •Multiple errors
- •Safety lockout
- •Control problems
Safe DIY Checks
- •Clear other error codes
Rheem Error Codes
Efficient systems with user-friendly codes
No Heating Call
Common Causes
- •Thermostat issues
- •Wiring problems
- •Control board
Safe DIY Checks
- •Check thermostat settings
- •Verify power
No Cooling Call
Common Causes
- •Thermostat problems
- •Wiring issues
- •Control failure
Safe DIY Checks
- •Check cooling settings
- •Verify connections
Limit Switch Open
Common Causes
- •Overheating
- •Poor airflow
- •Bad switch
Safe DIY Checks
- •Replace air filter
- •Check vents
High Pressure Switch
Common Causes
- •Dirty condenser
- •Overcharged system
- •Bad switch
Safe DIY Checks
- •Clean outdoor unit
Gas Valve Error
Common Causes
- •Gas valve failure
- •Electrical issues
- •Control problems
Safe DIY Checks
- •Check gas supply
Low Pressure Switch
Common Causes
- •Low refrigerant
- •Blockage
- •Switch failure
Safe DIY Checks
- •Check air filter
Rollout Switch Open
Common Causes
- •Overheating
- •Venting problems
- •Gas pressure
Safe DIY Checks
- •Check exhaust venting
Auxiliary Heat Issue
Common Causes
- •Electric heat problems
- •Breaker off
- •Element failure
Safe DIY Checks
- •Check breakers
Pressure Switch Error
Common Causes
- •Venting issues
- •Switch failure
- •Blockage
Safe DIY Checks
- •Inspect exhaust vent
Ignition Failure
Common Causes
- •Igniter problems
- •Gas issues
- •Control failure
Safe DIY Checks
- •Verify gas is on
Flame Sensor
Common Causes
- •Dirty sensor
- •Sensor failure
- •Wiring issues
Safe DIY Checks
- •None - gas system
Blower Motor Error
Common Causes
- •Motor failure
- •Capacitor bad
- •Airflow restriction
Safe DIY Checks
- •Check for blockages
Indoor Temperature Sensor
Common Causes
- •Sensor failure
- •Wiring problems
- •Control issues
Safe DIY Checks
- •Check thermostat
Outdoor Temperature Sensor
Common Causes
- •Bad outdoor sensor
- •Weather damage
- •Wiring
Safe DIY Checks
- •Visual inspection
Reversing Valve
Common Causes
- •Valve stuck
- •Solenoid failure
- •Control problems
Safe DIY Checks
- •None - refrigerant system
Defrost Control
Common Causes
- •Control board failure
- •Sensor problems
- •Timer issues
Safe DIY Checks
- •None - complex system
Communication Error
Common Causes
- •Wiring problems
- •Control board failure
- •Power issues
Safe DIY Checks
- •Check connections
Memory Error
Common Causes
- •Board failure
- •Power surge
- •Age-related failure
Safe DIY Checks
- •Power cycle system
Compressor Issue
Common Causes
- •Compressor failure
- •Electrical problems
- •Overheating
Safe DIY Checks
- •Ensure proper clearance
System Lockout
Common Causes
- •Multiple faults
- •Safety shutdown
- •Control failure
Safe DIY Checks
- •Clear other codes first
Goodman Error Codes
Affordable reliable systems with clear codes
EEPROM Error
Common Causes
- •Control board failure
- •Memory corruption
- •Power surge
Safe DIY Checks
- •Power cycle the system
High Pressure Switch
Common Causes
- •Dirty outdoor coil
- •Overcharged system
- •Bad switch
Safe DIY Checks
- •Clean condenser coil
Low Pressure Switch
Common Causes
- •Low refrigerant
- •Dirty filter
- •Blockage
Safe DIY Checks
- •Replace air filter
Open Temperature Sensor
Common Causes
- •Sensor failure
- •Loose wiring
- •Damage
Safe DIY Checks
- •Check sensor connections
Shorted Temperature Sensor
Common Causes
- •Sensor shorted
- •Wiring damage
- •Water intrusion
Safe DIY Checks
- •Check for water damage
Open Coil Sensor
Common Causes
- •Coil sensor failure
- •Wiring problems
- •Corrosion
Safe DIY Checks
- •Visual inspection
Shorted Coil Sensor
Common Causes
- •Sensor shorted
- •Moisture damage
- •Wiring issues
Safe DIY Checks
- •Check for moisture
Open Outdoor Sensor
Common Causes
- •Outdoor sensor failure
- •Weather damage
- •Disconnected
Safe DIY Checks
- •Check outdoor sensor
Shorted Outdoor Sensor
Common Causes
- •Sensor damage
- •Water intrusion
- •Wiring fault
Safe DIY Checks
- •Inspect for water damage
Indoor Blower Off
Common Causes
- •Motor failure
- •Control issues
- •Power problems
Safe DIY Checks
- •Check circuit breakers
Reversing Valve
Common Causes
- •Valve stuck
- •Solenoid failure
- •Control problems
Safe DIY Checks
- •None - refrigerant system
Outdoor Unit Off
Common Causes
- •Power issues
- •Control failure
- •Safety lockout
Safe DIY Checks
- •Check outdoor breaker
Malfunction or No Call
Common Causes
- •Thermostat issues
- •Wiring problems
- •Control failure
Safe DIY Checks
- •Check thermostat settings
Open Fuse
Common Causes
- •Blown fuse
- •Electrical overload
- •Short circuit
Safe DIY Checks
- •Check and replace fuses
Outdoor Coil Sensor
Common Causes
- •Coil sensor failure
- •Wiring issues
- •Environmental damage
Safe DIY Checks
- •Visual inspection
Transducer Fault
Common Causes
- •Pressure transducer failure
- •Wiring problems
- •Control issues
Safe DIY Checks
- •None - complex system
High Pressure Fault
Common Causes
- •System overcharged
- •Dirty coil
- •Restriction
Safe DIY Checks
- •Clean outdoor coil
Low Pressure Fault
Common Causes
- •Refrigerant leak
- •Blockage
- •Low charge
Safe DIY Checks
- •Check air filter
Reverse Polarity
Common Causes
- •Incorrect wiring
- •Installation error
- •Power issues
Safe DIY Checks
- •None - electrical safety
Sensor Fault
Common Causes
- •Multiple sensor issues
- •Control problems
- •Wiring fault
Safe DIY Checks
- •Power cycle system
York Error Codes
Dependable systems with comprehensive diagnostics
Low Pressure Switch
Common Causes
- •Low refrigerant
- •Dirty evaporator
- •Blockage
Safe DIY Checks
- •Replace air filter
- •Check indoor vents
High Pressure Switch
Common Causes
- •Dirty condenser
- •Overcharged system
- •Bad switch
Safe DIY Checks
- •Clean outdoor unit
Low Pressure Transducer
Common Causes
- •Transducer failure
- •Low refrigerant
- •Wiring issues
Safe DIY Checks
- •None - complex system
High Pressure Transducer
Common Causes
- •Transducer bad
- •High pressure
- •Control problems
Safe DIY Checks
- •Clean condenser
Outdoor Coil Temperature
Common Causes
- •Coil sensor failure
- •Wiring problems
- •Environmental
Safe DIY Checks
- •Check outdoor coil
Indoor Coil Temperature
Common Causes
- •Indoor coil sensor bad
- •Ice formation
- •Airflow issues
Safe DIY Checks
- •Check for ice
- •Replace filter
Outdoor Temperature Sensor
Common Causes
- •Outdoor sensor failure
- •Weather damage
- •Wiring
Safe DIY Checks
- •Visual inspection
Indoor Temperature Sensor
Common Causes
- •Indoor sensor bad
- •Thermostat issues
- •Wiring problems
Safe DIY Checks
- •Check thermostat
Discharge Temperature Sensor
Common Causes
- •Compressor sensor bad
- •Overheating
- •Wiring fault
Safe DIY Checks
- •Ensure proper airflow
Defrost Temperature Sensor
Common Causes
- •Defrost sensor failure
- •Ice buildup
- •Control issues
Safe DIY Checks
- •None - complex defrost system
Communication Error
Common Causes
- •Wiring problems
- •Control board failure
- •Power issues
Safe DIY Checks
- •Check electrical connections
Indoor Blower Motor
Common Causes
- •Motor failure
- •Capacitor bad
- •Control problems
Safe DIY Checks
- •Check for obstructions
Outdoor Fan Motor
Common Causes
- •Fan motor failure
- •Capacitor issues
- •Wiring problems
Safe DIY Checks
- •Remove debris from fan
Compressor Contactor
Common Causes
- •Bad contactor
- •Electrical issues
- •Control failure
Safe DIY Checks
- •Check circuit breakers
Reversing Valve
Common Causes
- •Valve stuck
- •Solenoid bad
- •Control problems
Safe DIY Checks
- •None - refrigerant system
Auxiliary Heat
Common Causes
- •Electric heat failure
- •Breaker off
- •Element bad
Safe DIY Checks
- •Check circuit breakers
Memory Error
Common Causes
- •Control board failure
- •Power surge
- •Programming lost
Safe DIY Checks
- •Power cycle the system
System Configuration Error
Common Causes
- •Setup problems
- •Incorrect settings
- •Control issues
Safe DIY Checks
- •None - requires programming
Airflow Error
Common Causes
- •Blocked filter
- •Closed vents
- •Ductwork problems
Safe DIY Checks
- •Replace filter
- •Open all vents
System Lockout
Common Causes
- •Multiple faults
- •Safety shutdown
- •Control failure
Safe DIY Checks
- •Clear other error codes
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
Union
24/7 HVAC error code diagnosis and emergency repair service
Westfield
24/7 HVAC error code diagnosis and emergency repair service
Summit
24/7 HVAC error code diagnosis and emergency repair service
Plainfield
24/7 HVAC error code diagnosis and emergency repair service
Linden
24/7 HVAC error code diagnosis and emergency repair service
Cranford
24/7 HVAC error code diagnosis and emergency repair service
Clark
24/7 HVAC error code diagnosis and emergency repair service
Scotch Plains
24/7 HVAC error code diagnosis and emergency repair service
Roselle
24/7 HVAC error code diagnosis and emergency repair service
Rahway
24/7 HVAC error code diagnosis and emergency repair service
Berkeley Heights
24/7 HVAC error code diagnosis and emergency repair service
New Providence
24/7 HVAC error code diagnosis and emergency repair service
Garwood
24/7 HVAC error code diagnosis and emergency repair service
Kenilworth
24/7 HVAC error code diagnosis and emergency repair service
Mountainside
24/7 HVAC error code diagnosis and emergency repair service
Roselle Park
24/7 HVAC error code diagnosis and emergency repair service
Fanwood
24/7 HVAC error code diagnosis and emergency repair service
Winfield
24/7 HVAC error code diagnosis and emergency repair service
Springfield
24/7 HVAC error code diagnosis and emergency repair service
Hillside
24/7 HVAC error code diagnosis and emergency repair service
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.
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