LENNOX ERROR CODE • TRI-STATE AREA
Lennox Error Code 228: Complete Troubleshooting Guide
Ignition Failure - Your Lennox furnace failed to establish a flame. Learn the causes, safe DIY checks, and when professional help is needed.
What is Lennox Error Code 228?
Lennox error code 228 indicates an Ignition Failure. Your furnace's control board detected that the burners failed to ignite after the standard retry sequence (typically 3-4 attempts). As a safety measure, the system enters lockout mode and won't restart until manually reset.
This error appears on Lennox Elite, Merit, and Signature series furnaces. The ignition sequence involves the draft inducer starting, pressure switch closing, hot surface igniter heating, and gas valve opening. Failure at any step can result in code 228.
The ignition lockout is an essential safety feature. Without it, unburned gas could accumulate in your furnace and home, creating explosion and carbon monoxide risks. While inconvenient, this protection prevents dangerous situations.
Gas Safety Warning
If you smell natural gas or propane, do NOT attempt troubleshooting. Leave immediately, call your gas company from outside, and don't operate electrical switches. Never try to manually light a furnace that won't ignite.
Common Causes of Code 228
1Failed Hot Surface Igniter
The #1 cause of code 228. The igniter heats to about 1,800°F to ignite gas. Over time, igniters crack and can't reach ignition temperature. They typically last 3-7 years. Signs include no visible glow when the furnace attempts to start.
2Dirty Flame Sensor
The flame sensor confirms flame presence. If coated with carbon or corroded, it can't detect the flame properly. This causes the furnace to ignite briefly then shut off. Cleaning with fine steel wool often resolves the issue.
3Gas Supply Problems
Verify the manual gas valve is open (handle parallel to pipe). Check that other gas appliances work. Low gas pressure from the utility or an empty propane tank prevents ignition regardless of igniter condition.
4Faulty Gas Valve
The gas valve opens when the control board signals ignition. If the valve solenoid or valve itself fails, gas won't reach the burners. You may hear the igniter glow and inducer run, but no gas flow sound when the valve should open.
5Clogged Burners
Spider webs, rust, or debris in burner ports prevent proper gas flow. This is common after extended non-use (summer months). Annual furnace maintenance includes burner cleaning.
DIY Troubleshooting Steps
Step 1: Check for Gas Smell
If you smell gas, stop immediately, leave your home, and call the gas company from outside.
Step 2: Verify Gas Supply
Check that the manual gas valve near the furnace is open (handle parallel to pipe). Verify other gas appliances work.
Step 3: Power Cycle
Turn off power for 30 seconds, then restore. The furnace will attempt ignition again. If code 228 returns immediately, professional service is needed.
Step 4: Observe Ignition Attempt
If comfortable, watch the ignition sequence. Note whether the igniter glows orange and whether gas flows (you'll hear a slight hissing). This information helps technicians diagnose the issue.
Expert Lennox Service Available
Most ignition issues require professional repair. Our technicians carry igniters and common parts for same-day service.
Call (908) 249-9701Frequently Asked Questions
What is Lennox error code 228?
Lennox error code 228 indicates an Ignition Failure, meaning the furnace attempted to ignite but failed to establish or maintain a flame. The system tried multiple ignition cycles and entered lockout mode for safety.
How do I reset Lennox error code 228?
Turn off power to the furnace for 30 seconds, then restore power. The system will attempt ignition again. If code 228 returns immediately, there's an underlying issue requiring professional diagnosis.
What causes Lennox ignition failure?
Common causes include a failed hot surface igniter, dirty flame sensor, gas supply issues (closed valve, low pressure), clogged burners, or control board problems. The igniter is the most frequent cause.
Can I fix Lennox error code 228 myself?
You can safely verify gas supply is on, check the filter, and perform a power reset. However, igniter replacement and flame sensor cleaning require professional service due to safety considerations and technical knowledge needed.
How long does it take to fix Lennox error code 228?
Most repairs can be completed in a single service visit. Igniter replacement takes 30-60 minutes. Flame sensor cleaning takes 15-30 minutes. Gas valve or control board replacement may take 1-2 hours. Our technicians arrive with common parts to minimize wait time.
Is Lennox error code 228 dangerous?
The lockout itself is a safety feature preventing gas accumulation. However, if you smell gas, leave immediately and call your gas company. Never attempt to manually light a furnace that won't ignite automatically.
Why does my Lennox furnace click but not ignite?
Clicking without ignition typically means gas isn't reaching the burners or the igniter isn't heating properly. Verify gas supply to other appliances works. If gas supply is confirmed, the igniter or gas valve likely needs service.
How long does a Lennox igniter last?
Lennox hot surface igniters typically last 3-7 years depending on usage and cycling frequency. They're consumable parts that naturally wear out and are among the most common furnace repairs.
Can a dirty filter cause Lennox code 228?
A dirty filter doesn't directly cause code 228, but severe airflow restriction can affect combustion and cause secondary issues. Always replace your filter as part of any furnace troubleshooting.
Why does code 228 happen in cold weather?
Cold weather increases furnace cycling, wearing igniters faster. Extreme cold can also affect gas pressure and cause condensation in gas lines. Higher demand exposes marginal components that might work fine in mild weather.
What's the difference between codes 228 and 201?
Code 228 is Ignition Failure (furnace can't start the flame). Code 201 is High Limit Fault (furnace overheats during operation). They affect different stages—228 is a startup problem, 201 is a running problem.
How do I know if my Lennox flame sensor is bad?
Signs include furnace igniting then shutting off within seconds, repeated code 228 after igniter replacement, or visible corrosion on the sensor rod. Flame sensors can be cleaned but may need replacement if cleaning doesn't help.
Can I clean the flame sensor on my Lennox furnace?
Yes, with power off, locate the flame sensor (thin metal rod near burners), remove the mounting screw, and gently clean with fine steel wool or emery cloth. Avoid touching the sensor with bare hands.
Why does my Lennox furnace ignite then shut off?
Igniting then immediately shutting off typically indicates a flame sensor problem—the sensor can't detect the flame, so the control board shuts off gas flow as a safety measure. This is different from failing to ignite at all.
Who repairs Lennox furnaces with code 228 in the tri-state area?
Dimatic Control LLC provides expert Lennox furnace repair throughout the tri-state area. Our technicians carry common replacement parts for same-day repairs. Call (908) 249-9701 for immediate assistance.
Need Help with Lennox Error Code 228?
Our certified technicians repair Lennox furnaces throughout the tri-state area with same-day service available.