Daikin RXYQ96PYDN Service Manual page 362

SiUS34-801A_b
Troubleshooting
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
When power is supplied.
YES
Electronic
expansion valve is
connected to X7A of
indoor unit PC
board.
YES
Coil
check (∗1) of
electronic expansion valve
drive indicates
normal.
YES
Relay
cables short circuit or
disconnected.
NO
∗1: How to check the coil of electronic expansion valve drive
Remove the connector for electronic expansion valve (X7A) from PC board. Measure the resistance
value between pins and check the continuity to judge the condition.
White (1)
φ1
Red (5) M
φ3
Orange (3)
φ2 φ4
Yellow Brown Blue
(2) (6)
The normal products will show the following conditions:
No continuity between (1) and (2)
Resistance value between (1) and (3) is approx. 300 Ω
Resistance value between (1) and (5) is approx. 150 Ω
Resistance value between (2) and (4) is approx. 300 Ω
Resistance value between (2) and (6) is approx. 150 Ω
Troubleshooting by Indication on the Remote Controller
NO
NO
NO
YES
1) White
2) Yellow
3) Orange
4) Blue
5) Red
(4)
6) Brown
Replace electronic expansion
valve main body.
Shut the power supply off after
connection and then restart.
Replace coil of electronic
expansion valve.
Replace relay cables.
When restarting the operation after
shutting the power supply off does
not work, replace indoor unit PC
board.
347