Daikin FXSQ40P7VEB [231/370] Electronic expansion valve coil abnormality

Daikin FXSQ100P7VEB [231/370] Electronic expansion valve coil abnormality
SiBE311209 Troubleshooting by Indication on the Remote Controller
Service Diagnosis 222
Electronic Expansion Valve Coil Abnormality
Remote
Controller
Display
A9
Applicable
Models
Indoor units except FXFQ models
Method of Error
Detection
Check coil condition of electronic expansion valve by using micro-computer.
Error Decision
Conditions
Pin input for electronic expansion valve coil is abnormal when initializing micro-computer.
Supposed
Causes
Defective drive of electronic expansion valve
Defective indoor unit PCB
Defective relay cables
Troubleshooting
Note:
1:How to check the electronic expansion valve coil
Remove the connector for electronic expansion valve (X7A) from PCB. Measure the resistance value between
pins and check the continuity to judge the condition.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
YES
NO
NO
NO
YES
YES
Shut the power supply OFF after
connection and then restart.
Replace the electronic expansion
valve coil.
Replace the relay cables.
When restarting the operation after
shutting the power supply OFF
does not work, replace the indoor
unit PCB.
Electronic
expansion valve is
connected to X7A of
indoor unit PCB.
Check (1) of
electronic
expansion valve
coil indicates
normal.
Relay cables
short circuit or
disconnected.
White (1)
Red (5)
Orange (3)
φ1
φ3
M
φ2 φ4
Yellow
(2)
Brown
(6)
Blue
(4)
1) White
2) Yellow
3) Orange
4) Blue
5) Red
6) Brown
The normal products will show the following conditions:
(1) No continuity between (1) and (2)
(2) Resistance value between (1) and (3) is approx. 300
(3) Resistance value between (1) and (5) is approx. 150
(4) Resistance value between (2) and (4) is approx. 300
(5) Resistance value between (2) and (6) is approx. 150

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