Haier Air Conditioner Error Code F25

F25 indicates a discharge temperature sensor failure on the outdoor unit. The outdoor control board is not receiving a valid signal from the thermistor that monitors refrigerant temperature leaving the compressor. The outdoor LED1 will flash 13 times to signal this specific fault. The system will not operate normally until the fault is resolved.

No, you should not attempt to bypass or ignore the F25 fault. The discharge temperature sensor protects the compressor from running under dangerously high refrigerant temperatures. Operating without a functioning sensor removes that protection and can result in compressor damage, which is a costly repair.

A power reset may temporarily clear the fault display, but the F25 code will return if the underlying problem with the sensor, connector, or PCB has not been corrected. A reset is not a repair. The connector, thermistor resistance, and board should be checked in sequence before assuming the issue is resolved.

A homeowner can safely inspect and reseat the sensor connector on the outdoor unit, which is the first recommended diagnostic step. However, measuring thermistor resistance and replacing the thermistor or outdoor PCB requires basic electrical knowledge and a multimeter. If you are not comfortable working with electrical components, a qualified HVAC technician should perform the diagnosis and repair.

Cost depends on the failed component. Reseating a loose connector costs nothing beyond a service call fee. A replacement discharge thermistor is generally an inexpensive part, with total repair costs typically in the range of $75 to $200 including labor. If the outdoor PCB requires replacement, costs can range from $200 to $600 or more depending on the unit model and local labor rates.