F04 🟡 Repair Required
Goodman Error Code F04: Goodman Code F04 - High Limit Switch Open
⚠️ Your Goodman furnace has shut down due to a high limit error. This prevents the furnace from overheating, but it needs professional diagnosis to restore heat.
How to Fix Goodman Code F04
- Step 1: Check and replace your air filter. A dirty filter is the most common cause. Use the filter size printed on the old filter to buy a new one.
- Step 2: Ensure all return air vents are open and not blocked by furniture or rugs. Good airflow is key.
- Step 3: Reset the furnace by turning off the power at the breaker for 60 seconds, then turn it back on. If the error returns, call a qualified HVAC technician.
What Does Goodman Error Code F04 Mean?
The F04 error code on your Goodman furnace indicates that the high limit switch has tripped. This switch is a safety device designed to shut down the furnace if it gets too hot, preventing damage and potential fire hazards. When the furnace overheats, the high limit switch opens, cutting off power to the gas valve and blower motor. The furnace will then display the F04 error, indicating the problem. It's important to address this issue promptly, as repeated overheating can damage components and leave you without heat.
Common Causes of Goodman Code F04
- Dirty air filter restricting airflow
- Blocked return air vents reducing airflow to the furnace
- Faulty blower motor not moving enough air across the heat exchanger
- Over firing of the burners causing excessive heat
- Defective high limit switch tripping prematurely
Applicable Goodman Models
Need a Pro to Fix Goodman Code F04?
A licensed HVAC technician can diagnose and fix this issue quickly.
Find a Licensed Tech Near You →Replacement Parts for Goodman Furnace Code F04
High Limit Switch OEM: B13701-22
Blower Motor
Air Filter