A9" Electronic Expansion Valve Malfunction / Dust Clogging - Daikin RTSQ20PY1 Service Manual

SiBE31-801_C
A9
4.6 " " Electronic Expansion Valve Malfunction / Dust
Clogging
A9
Remote
Controller
Display
Applicable FXFQ25~125P
Models
Method of Check coil condition of electronic expansion valve by using micro-computer.
Check dust clogging condition of electronic expansion valve main body by using micro-
Malfunction
computer.
Detection
Malfunction 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.
Decision
Conditions
Supposed
Causes
Troubleshooting
Temperature of suction air (R1T) – temperature of liquid pipe of heat exchanger (R2T)>8°C
Temperature of liquid pipe of heat exchanger (R2T) shows fixed degrees or below.
Defective drive of electronic expansion valve
Defective PCB of indoor unit
Defective relay cables
Troubleshooting by Indication on the Remote Controller
232