Daikin RQYQ140-180PY1 Service Manual page 131

SiBE341001
Troubleshooting
Troubleshooting
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.106~P.107 for how to check.)
When Confirmation of malfunction 4 shows as follows:
→ Electronic expansion valve for main use (Y1E)
When Confirmation of malfunction 4 shows as follows:
→ Electronic expansion valve for refrigerant charge (Y2E)
When Confirmation of malfunction 4 shows as follows:
→ Electronic expansion valve for subcooling (Y3E)
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 50 Ω .
(Orange) 1
(Red) 2
(Yellow) 3
(Black) 4
5
COM[+] (Gray) 6
YES
NO
Master unit
Slave unit 1
Slave unit 2
System
NO
YES
NO
YES
Measuring points
Judgement criteria
1 - 6
2 - 6
3 - 6
4 - 6
Troubleshooting by Remote Controller
External factor other than
malfunction (for example, noise
etc.).
E9
" in the monitor
Ensure correct connection.
Replace the electronic
expansion valve coil.
Replace the outdoor unit PCB
(A1P).
40~50 Ω
122