Sanden Heat Pump G2 GAU-A45HPA Error Codes 

This is the PDF of the Sanden Heat Pump G2 GAU-A45HPA error codes from the Sanden Heat Pump - Service Technical Book Pages 25 - 35.

"When an error has occurred, a red lamp on the LED status window turns on and an error code is displayed on the display window. The panel does not turn to the display sleep mode while the error code is shown.

After a component is replaced or the inspection is completed, turn the breaker on/off several times to confirm the error does not re-occur.

Below is the list of the error codes. If the corrective action does not solve the error problem, a malfunction of the PCB valve is highly likely."