Daikin R71FUV1 Service Manual page 214

Troubleshooting by Remote Controller
Remote Controller Display
E9
Applicable Models
RZQ-H, RZQ(S)-C
Method of Error Detection
The error is detected by the suction pipe superheated
degree and electronic expansion valve opening degree
calculated by values of suction pipe thermistor.
Error Decision Conditions
When the following conditions are met for 10 minutes
Suction pipe superheated degree < 4°C
Minimum electronic expansion valve opening degree
Connector of electronic expansion valve is missing
when the power is ON.
Supposed Causes
Defective electronic expansion valve
Defective solenoid valve
Defective check valve
Disconnection of electronic expansion valve harness
Defective connection of electronic expansion valve
connector
Defective each thermistor
Defective mounting
Defective outdoor unit control PCB
Si20-701_B
207