Lennox Error Code 1: Ignition Failure
Warning: Your Lennox HVAC system has encountered an ignition failure, which requires professional attention.
LED Blink Pattern
LED blinks 1 time.
How to Fix Lennox Code 1
- Step 1: Turn off your HVAC system at the thermostat and the main gas valve to ensure safety.
- Step 2: Do not attempt to open the unit or touch any internal components.
- Step 3: Contact a professional Lennox HVAC technician to diagnose and repair the issue.
How to Reset Lennox Code 1
- Turn off the furnace power switch, usually located on or near the unit.
- Turn off the circuit breaker for the furnace. Wait 30 seconds.
- Restore power at the breaker and flip the furnace switch back on.
- Set the thermostat to call for heat. If the error code returns after 2-3 ignition attempts, the fault requires repair.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Lennox Error Code 1 Mean?
The error code 1 on your Lennox HVAC system indicates that the ignition system has failed to ignite the burner. This could be due to a few reasons, but it's important to note that attempting to fix this issue yourself can be dangerous and should be left to a professional technician. The ignition system is responsible for lighting the burner that heats the air in your home. If it's not working, your HVAC system won't be able to heat your home effectively.
Common Causes
- Faulty ignition control module
- Dirty or malfunctioning flame sensor
- Clogged or damaged burner
- Low gas pressure
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| The burner does not ignite when the system calls for heat | Inspect the ignition control module for signs of damage or failure | No visible damage or failure |
| The flame sensor is dirty or covered in soot | Clean the flame sensor using a fine-grit sandpaper or a specialized cleaner | A clean, shiny sensor |
Applicable Lennox Models
- Lennox Healthy Climate(dual_fuel)
- Dave Lennox Signature Collection(gas)
- EL296(electric)
- EL296V(electric)
- ELP(electric)
- Elite Series(electric)
- G61(gas)
- Health Saver Series(electric)
- ML195(dual_fuel)
- ML199(gas)
- NCB(electric)
- NPE(electric)
- Pace Series(electric)
- SLO(gas)
- SLP(electric)
- SLP98(gas)
- SLP98V(gas)
- Slimline Series(electric)
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Ignition Control Module | 30-186-1200 | — | Find Part |
| Flame Sensor | 30-186-1201 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Lennox model families as 1.
| Code | Description | Severity |
|---|---|---|
| 2 | Pressure Switch Stuck Closed | Warning |
| 3 | Pressure Switch Stuck Open | Warning |
| 4 | High Limit Switch Open | Warning |
| 5 | Flame Rollout Switch Open | Warning |
| 6 | Pressure Switch System Lockout | Warning |
| 7 | Ignition Lockout | Warning |
| 8 | Control Board Error | Warning |
| 9 | Line Voltage Polarity Incorrect | Warning |
| E250 | Lennox Code E250 - Indoor Blower Communication Error | Warning |