Daikin VRVII - A9 Electronic Expansion Valve Coil Abnormality; Dust Clogging

Troubleshooting by Indication on the Remote Controller
68
3.9
A9
Electronic Expansion Valve
Coil Abnormality / Dust
Clogging
Remote Controller Display
A9
Applicable Models
All indoor models
Method of Error Detection
Check the coil condition of electronic expansion valve by
using micro-computer.
Check the dust clogging condition of electronic
expansion valve main body by using micro-computer.
Error 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 – temperature of liquid pipe
of heat exchanger > 8°C.
z Temperature of liquid pipe of heat exchanger shows
fixed degrees or below.
Supposed Causes
 Defective electronic expansion valve coil
 Defective PCB indoor unit
 Defective relay cables