SiUS30-1301
Troubleshooting by Indication on the Remote Controller
Service Diagnosis
167
3.7
Electronic Expansion Valve Coil Abnormality / Dust
Clogging
Error Code
A9
Applicable
Models
FXFQ
Method of Error
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.
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.
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.
Supposed
Causes
Defective of electronic expansion valve coil
Defective PCB indoor unit
Defective relay cables
Troubleshooting
NO
YES
When power
is supplied.
NO
Electronic
expansion valve is
connected to X7A of
indoor unit
PCB.
NO
Coil
check of
electronic expansion
valve drive indicates
normal.
NO
YES
YES
YES
Relay
cables short circuit
or disconnected.
When restarting the operation
after shutting the power supply
OFF does not work, replace the
indoor unit PCB.
Replace the relay cables.
Replace the electronic
expansion valve coil.
Shut the power supply OFF
after connection and then
restart.
Replace the electronic
expansion valve main body.
CHECK 9
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
CHECK 9