Lennox Error Code 2: Pressure Switch Stuck Closed
Warning: Your Lennox HVAC system has a pressure switch issue that requires professional repair.
How to Fix Lennox Code 2
- Turn off your HVAC system at the thermostat and the circuit breaker to prevent further issues.
- Contact a professional Lennox technician to diagnose and repair the problem.
How to Reset Lennox Code 2
- 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.
What does 2 mean?
Error code 2 on your Lennox HVAC system indicates that the pressure switch is stuck closed. The pressure switch is a safety device that monitors the system's refrigerant pressure. When it's stuck closed, it can cause the system to over-pressurize, leading to potential damage and system lockout. This issue is common in Lennox systems due to dirt, debris, or faulty switch components.
Affected Models
- SLP98V
- SLP98
- EL296V
- EL296
- SLP
- SLP
- ELP
- ELP
- NCB
- NPE
- Elite Series
- Elite Series
- Dave Lennox Signature Collection
- Dave Lennox Signature Collection
- ML195
- SLO
- EL296
- SLP98V
- EL296V
- G61
- ELP
- NCB
- NPE
- NPE
- ML195
- ML199
- Elite Series
- Dave Lennox Signature Collection
- Lennox Healthy Climate
- Elite Series
- Elite Series
- Slimline Series
- Slimline Series
- Health Saver Series
- Pace Series
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Pressure Switch | 46-001530-00 | — |
Related Codes on Same Models
| Code | Description | Severity |
|---|---|---|
| 1 | Ignition Failure | 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 |