Daikin Heat Pump Error Code F8

The F8 code indicates a system shutdown due to compressor internal temperature abnormality. During forced cooling operation, the discharge pipe thermistor detected a temperature exceeding 127.5°C, triggering an automatic protective shutdown. The system will not restart until the underlying cause is identified and resolved.

No. The F8 code represents a protective shutdown, meaning the system has already stopped itself to prevent compressor damage. Attempting to bypass or repeatedly reset the system without addressing the cause can result in permanent compressor failure, which is the most expensive component in the unit. Leave the system off until the fault is diagnosed and corrected.

Repair costs vary widely depending on the cause. A coil cleaning or piping correction may cost between $100 and $300 in labor. A refrigerant leak repair and recharge typically ranges from $200 to $600 depending on refrigerant type and the amount needed. Thermistor replacement is usually $150 to $350 in parts and labor. Compressor replacement, if damage has already occurred, can range from $1,200 to $3,000 or more.

Some checks, such as inspecting outdoor piping for visible deformation, cleaning a blocked condenser coil, or clearing debris from around the outdoor unit, can be done without professional tools. However, diagnosing refrigerant charge issues, testing thermistor resistance, or inspecting expansion valve operation requires specialized equipment and should be handled by a qualified HVAC technician.

A power reset may clear the code temporarily and allow the unit to restart, but if the underlying cause, such as restricted piping, low refrigerant, or a faulty thermistor, is still present, the F8 error will return and trigger another shutdown. Resetting without repair is not a solution and risks compressor damage over repeated fault cycles.