Daikin RTSQ20PY1 Service Manual page 244

Troubleshooting by Indication on the Remote Controller
Troubleshooting
*1: How to check the electronic expansion valve coil
Orange (3)
233
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 PCB.
YES
Check (*1) of
electronic
expansion valve
coil indicates
normal.
YES
Relay cables short
circuit or
disconnected.
NO
Remove the connector for electronic expansion valve (X7A) from PCB. Measure the resistance value
between pins and check the continuity to judge the condition.
White (1)
φ 1
M
Red (5)
φ 3
φ 2 φ 4
Yellow Brown Blue
(2) (6) (4)
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 Ω
(3) Resistance value between (1) and (5) is approx. 150 Ω
(4) Resistance value between (2) and (4) is approx. 300 Ω
(5) Resistance value between (2) and (6) is approx. 150 Ω
NO
NO
NO
YES
1) White
2) Yellow
3) Orange
4) Blue
5) Red
6) Brown
SiBE31-801_C
Replace the electronic expansion
valve main body.
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.
Troubleshooting