A9 Indoor Unit: Electronic Expansion Valve; Malfunction / Dust Clogging - Daikin RXYQ96PYDN Service Manual

Troubleshooting by Indication on the Remote Controller
A9
3.6 Indoor Unit: Electronic Expansion Valve

Malfunction / Dust Clogging

A9
Remote
Controller
Display
Applicable
FXFQ
Models
Method of
Check coil condition of electronic expansion valve by using microcomputer.
Malfunction Check dust clogging condition of electronic expansion valve main body by using 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
346
Temperature of suction air (R1T) – temperature of liquid pipe of heat exchanger (R2T)>46.4°F.
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
SiUS34-801A_b
Troubleshooting