Daikin REYQ8-48PY1B - 3.14 “C9” Indoor Unit: Malfunction of Thermistor (R1 T) for Suction Air

SiBE37-701_B Troubleshooting by Indication on the Remote Controller
Troubleshooting 272
3.7
“
A9
”
Electronic Expansion Valve Malfunction / Dust
Clogging
Remote
Controller
Display
A9
Applicable
Models
FXFQ25~125P
Method of
Malfunction
Detection
Check coil condition of electronic expansion valve by using micro-computer.
Check dust clogging condition of electronic expansion valve main body by using micro-
computer.
Malfunction
Decision
Conditions
Pin input for electronic expansion valve coil is abnormal when initializing micro-computer.
Either of the following conditions is seen/caused/ occurs while the unit stops operation.
z
Temperature of suction air (R1T) – temperature of liquid pipe of heat exchanger (R2T)>8°C.
z
Temperature of liquid pipe of heat exchanger (R2T) shows fixed degrees or below.
Supposed
Causes

Defective drive of electronic expansion valve

Defective PCB of indoor unit

Defective relay cables