Lennox Error Code F2
Evaporator temperature sensor fault
Error Code Summary
| Brand | Lennox |
| Error Code | F2 |
| Meaning | Evaporator temperature sensor fault |
| Cause | Indoor coil thermistor open or short circuit |
| Recommended Action | Check sensor connection, measure resistance, replace if faulty |
How to Fix Lennox Error F2
- 1
Power Cycle the Unit
Turn off the unit at the breaker, wait 5 minutes, then restore power. Some errors auto-clear after a restart.
- 2
Identify the Issue
Error F2 means: Evaporator temperature sensor fault. The most common cause is: Indoor coil thermistor open or short circuit.
- 3
Take Corrective Action
Check sensor connection, measure resistance, replace if faulty
- 4
Test the System
After completing repairs, run the system and monitor for the error code. If it recurs, the issue may require professional diagnosis.
Safety Notice
Always disconnect power before performing any electrical work. If you're not a certified HVAC technician, contact a qualified professional for repairs involving refrigerant, electrical components, or compressor work.
Frequently Asked Questions
What does Lennox error code F2 mean?
Lennox error code F2 indicates: Evaporator temperature sensor fault. This is typically caused by: Indoor coil thermistor open or short circuit.
How do I fix Lennox error code F2?
To fix Lennox error code F2: Check sensor connection, measure resistance, replace if faulty. If the error persists after these steps, contact a qualified HVAC technician.
Is Lennox error code F2 serious?
Error code F2 (Evaporator temperature sensor fault) should be addressed promptly to prevent further damage to your Lennox system. Always turn off the unit if you notice unusual sounds, smells, or continued malfunction.