Lennox Error Code 7: Ignition Lockout
Warning: Your Lennox HVAC system has entered ignition lockout. It's safe, but needs professional attention.
LED Blink Pattern
LED blinks 7 times.
How to Fix Lennox Code 7
- Check if your system has power. If not, reset the circuit breaker.
- Listen for any unusual noises from your furnace. If you hear any, call a professional.
- Do not attempt to open your furnace or tamper with any internal components.
How to Reset Lennox Code 7
- 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 7 Mean?
Lennox error code 7, or ignition lockout, means your heating system has temporarily shut down to prevent damage. This could be due to a safety feature kicking in, or a minor issue that needs addressing. Don't worry, it's not a gas leak or fire risk, but it's best to get it checked out.
Common Causes
- Safety feature activated due to high flame rollout or improper ignition
- Faulty igniter or flame sensor
- Clogged or dirty flame sensor
- Incorrect gas pressure or flow
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Furnace is not running | Reset the circuit breaker | Furnace should restart |
| Furnace runs but doesn't ignite | Inspect the igniter and flame sensor | No visible damage or dirt |
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 |
|---|---|---|---|
| Igniter | 65-598325-00 | — | Find Part |
| Flame Sensor | 65-598326-00 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Lennox model families as 7.
| Code | Description | Severity |
|---|---|---|
| 1 | Ignition Failure | Warning |
| 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 |
| 8 | Control Board Error | Warning |
| 9 | Line Voltage Polarity Incorrect | Warning |
| E250 | Lennox Code E250 - Indoor Blower Communication Error | Warning |