Haier Heat Pump Error Code 2 flashes

Two flashes on a Haier heat pump indicate a compressor discharge temperature sensor failure. The control board has detected that the sensor connected at the CN7 port is sending an invalid or absent signal. The fault triggers 30 seconds after the signal loss is detected, and the system will not operate normally until the sensor issue is resolved.

The 2-flash fault is designed to prevent the compressor from running without valid discharge temperature monitoring, which protects the compressor from undetected overheating. You should not attempt to bypass this fault and run the system, as doing so could risk compressor damage. Address the sensor issue before returning the unit to service.

Repair costs depend on what is causing the fault. If only the CN7 connector needs reseating, the cost may be limited to a service call fee, typically in the range of $75 to $150. If the discharge temperature sensor itself needs replacement, parts and labor combined generally range from $100 to $300 depending on your location and technician rates. Control board replacement, if required, would be a higher-cost repair.

If you are comfortable working with electrical connectors, you can start by checking whether the sensor connector at CN7 on the control board is fully seated and free of corrosion. Reseating a loose connector may resolve the fault without any parts needed. However, if the sensor or wiring harness needs replacement, or if the control board is suspect, a qualified technician should handle the repair.

Because this fault is classified as resumable, the system can recover once the underlying sensor issue is corrected. A power reset may temporarily clear the fault code, but the error will return within 30 seconds if the sensor or its wiring connection at CN7 remains faulty. A reset is not a fix and should only be used after the sensor connection has been inspected and corrected.