Goodman Air Conditioner Error Code FP

FP stands for Freeze Protection Engaged. It means the system detected a room temperature at or below 40°F via the wireless remote thermostat or the indoor ambient thermistor sensor. The unit suspends operation automatically to protect itself and the space. Normal operation resumes automatically once the room temperature rises above 43°F.

A manual reset will not permanently resolve the FP code if the underlying condition, which is a room temperature below 40°F as read by the sensor, still exists. The code will reappear as soon as the system checks the ambient temperature again. The condition must clear naturally or the sensor issue must be corrected before the code will stay off.

If the FP code is triggered by actual cold room temperatures, there is no repair cost since the system resolves itself. If the cause is a faulty indoor ambient thermistor, replacement parts typically range from $15 to $60 depending on the model, with professional labor adding $75 to $200 or more. Repositioning a wireless remote thermostat to avoid drafts is a no-cost fix you can do yourself.

In most cases, no manual fix is required. The FP code will clear on its own when the room temperature climbs above 43°F. If the code appears repeatedly and the room is not actually cold, check the placement of the wireless remote thermostat for drafts and inspect the indoor ambient thermistor for resistance faults. Correcting the temperature sensor location or replacing a faulty thermistor typically resolves recurring false triggers.

The FP code itself is a safety and protection feature, not an indication of a dangerous fault. The system is working as designed by halting operation in very cold conditions. However, if the code is appearing falsely due to a bad thermistor or misplaced remote thermostat, the unit may be unnecessarily preventing heating or cooling. Addressing the root cause ensures the system operates correctly when needed.