GREE AIR SOURCE HEAT PUMP WATER HEATER SERVICE MANUAL
10
CONTROL
1 Unit Control
1.1 Overall Control Logic
(1) High pressure switch
When the detected voltage exceeds the preset value, a fault will be displayed and the unit will stop or
not start.
(2) Temperature sensor fault detection and handling
Once the temperature sensor for the ambient temperature, air discharge, air inhaling, pipe
temperature, or water tank is open-circuited or short-circuited, the corresponding fault code will be
displayed and all loads will be cut off. After the fault is rectified, the unit automatically runs again.
1.2 Key Control Logics
(1) Control on compressor
After power is connected, start the system by the manual operator and detect the outdoor ambient
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