Daikin RTSQ20PY1 Service Manual page 266

Troubleshooting by Indication on the Remote Controller
Troubleshooting
255
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Turn power supply off, and
turn power supply on again.
Return to normal?
Check the electronic expansion valve corresponding to the malfunction code "
mode.
(Refer to P.216~217 for how to check.)
When Confirmation of malfunction 4 shows as follows:
→ Electronic expansion valve for main use (Y1E) or electronic expansion valve for liquid injection (Y1E)
When Confirmation of malfunction 4 shows as follows:
→ Electronic expansion valve for refrigerant charge (Y2E) or 2 stage selection 1 electronic expansion valve (Y2E1)
When Confirmation of malfunction 4 shows as follows:
→ Electronic expansion valve for subcooling (Y3E) or 2 stage selection 2 electronic expansion valve (Y2E2)
Explanation of " "
The connector of
outdoor unit PCB
(A1P) for electronic
expansion valve is
connected.
The coil resistance of
electronic expansion
valve is normal.
(Refer to ∗1)
∗ Make measurement of resistance between the connector pins, and then make sure the resistance
falls in the range of 40 to 50Ω.
(Orange) 1
(Red) 2
(Yellow) 3
(Black) 4
5
COM[+] (Gray) 6
YES
NO
Master unit
Slave unit
Function unit
NO
YES
NO
YES
Measuring points
Judgement criteria
1 - 6
2 - 6
3 - 6
4 - 6
External factor other than
malfunction (for example, noise
etc.).
E9
" in the monitor
Ensure correct connection.
Replace the connecting cable.
Replace the outdoor unit PCB
(A1P).
40~50Ω
Troubleshooting
SiBE31-801_C