Goodman Error Code 4: Open High Limit Switch
Warning: Your Goodman HVAC system has detected an open high limit switch, which could lead to overheating and system damage. Turn off the system and call a professional for repair.
How to Fix Goodman Code 4
- Step 1: Turn off your HVAC system at the thermostat and the circuit breaker to prevent further operation.
- Step 2: Do not attempt to open or disassemble your HVAC unit. This error requires professional diagnosis and repair.
- Step 3: Contact a licensed HVAC technician to inspect and repair your system.
How to Reset Goodman Code 4
- 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 4 mean?
The Goodman 4 error, also known as an open high limit switch, indicates that your HVAC system has detected an issue with its high limit switch. This switch is designed to monitor the temperature of your system's heat exchanger and prevent it from overheating. When the switch is open, it can't perform its function, leading to potential system damage. This error is typically caused by a faulty switch, but it could also be due to a wiring issue or a problem with the system's temperature sensor.
Affected Models
Recall Notices
Goodman/Daikin Evaporator Coil Drain Pans Recalled Due to Fire Hazard
22-014
Drain pans can overheat, melt, and deform, posing a fire hazard. Recall expanded January 2024.
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| High Limit Switch | 4BH13-100 | — |
Related Codes on Same Models
| Code | Description | Severity |
|---|---|---|
| STEADY-ON | Normal Operation | Info |
| 1 | System Lockout | Warning |
| 2 | Pressure Switch Stuck Closed | Warning |
| 3 | Pressure Switch Stuck Open | Warning |
| 5 | Flame Sensed With Gas Valve Off | Warning |
| 6 | Open Rollout Switch | Warning |
| 7 | Low Flame Signal | Warning |
| 8 | Ignitor Error | Warning |
| CONTINUOUS | Reversed Polarity | Warning |
| F01 | Goodman Code F01 - Ignition Lockout | Critical |