Daikin REYQ8-48PY1B, Service Manual

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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