Lennox Error Code P2
Low pressure switch open
Error Code Summary
| Brand | Lennox |
| Error Code | P2 |
| Meaning | Low pressure switch open |
| Cause | Low pressure switch tripped due to low suction pressure |
| Recommended Action | Check for refrigerant leaks, verify charge, inspect expansion valve |
How to Fix Lennox Error P2
- 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 P2 means: Low pressure switch open. The most common cause is: Low pressure switch tripped due to low suction pressure.
- 3
Take Corrective Action
Check for refrigerant leaks, verify charge, inspect expansion valve
- 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 P2 mean?
Lennox error code P2 indicates: Low pressure switch open. This is typically caused by: Low pressure switch tripped due to low suction pressure.
How do I fix Lennox error code P2?
To fix Lennox error code P2: Check for refrigerant leaks, verify charge, inspect expansion valve. If the error persists after these steps, contact a qualified HVAC technician.
Is Lennox error code P2 serious?
Error code P2 (Low pressure switch open) 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.