Gree Multi+ Ultra MULTIU18HP230V1DO Service & Parts Manual page 36

Malfunction display: F2 Failure of Evaporator Temp. Sensor
Failure of condenser Temp sensor
Check if the plug of the temperature sensor is correctly
connected with socket on the mainboard
Remove the sensor to check if the resistance value is ok
Replace mainboard of the indoor uint
34
Y
Y
Y
N
Check the direction of the plug and
socket
N
Replace temperature sensor
Service Manual
Installation and Maintenance