Goodman Error Code 4: Open High Limit Switch

LED Blink Pattern

How to Fix Goodman Code 4

1. Step 1: Turn off your HVAC system at the thermostat and the circuit breaker to prevent further operation.
2. Step 2: Do not attempt to open or disassemble your HVAC unit. This error requires professional diagnosis and repair.
3. Step 3: Contact a licensed HVAC technician to inspect and repair your system.

How to Reset Goodman Code 4

1. Turn off the furnace power switch, usually located on or near the unit.
2. Turn off the circuit breaker for the furnace. Wait 30 seconds.
3. Restore power at the breaker and flip the furnace switch back on.
4. 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 Goodman Error Code 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.

Common Causes

• Faulty high limit switch
• Wiring issue related to the high limit switch
• Problem with the system's temperature sensor

Diagnostic Steps

Recall Notices

Replacement Parts

Related Codes on Same Models

Other codes that affect the same Goodman model families as 4.