Four Way Valve Performance Check; Inverter Unit Refrigerant System Check - Daikin FFQ09Q2VJUFFQ12Q2VJUFFQ15Q2VJUFFQ18Q2VJURX09QMVJURX12QMVJURX15QMVJURX18QMVJU Service Manual

Check
5.5

Four Way Valve Performance Check

Check No.13
5.6

Inverter Unit Refrigerant System Check

Check No.14
103
Turn the power off and then on
again.
Start heating operation.
S80
voltage at 208 - 230
VAC with compressor
on? (Fig. 1)
YES
Disconnect the four way valve coil
from the connector and check the
continuity.
Four way
valve coil resistance at
1000 ~ 2000 Ω?
YES
(Fig. 1)
Voltage at S80
208 - 230 VAC
Compressor
ON
Refrigerant system check
Is the
discharge pipe
thermistor disconnected
from the holder?
NO
Check for refrigerant leakage.
See the service diagnosis on
refrigerant shortage (U0).
∗ Four way valve coil
Cooling / Dry / Defrost: Not energized
Heating: energized
NO
NO
Time
(R14674)
YES
SiUS091628EA
Replace the outdoor unit
PCB (main PCB).
Replace the four way valve
coil.
Replace the four way valve.
(R21674)
Reconnect the thermistor.
Replace the refrigerant.
(R15833)
Service Diagnosis