A9 " Indoor Unit: Electronic Expansion Valve Malfunction; Dust Clogging - Daikin VRV III REYQ8PY1 Service Manual

Troubleshooting by Indication on the Remote Controller
A9
" " Indoor Unit:
3.6
Malfunction / Dust Clogging
A9
Remote
Controller
Display
Applicable FXFQ25~125M
Models
Method of Check coil condition of electronic expansion valve by using microcomputer.
Check dust clogging condition of electronic expansion valve main body by using
Malfunction
microcomputer.
Detection
Malfunction Pin input for electronic expansion valve coil is abnormal when initializing microcomputer.
Either of the following conditions is seen/caused/ occurs while the unit stops operation.
Decision
Conditions
Supposed
Causes
240
Electronic Expansion Valve
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 PC board of indoor unit
Defective relay cables
Si37-701
Troubleshooting