Service Manual

SiUS071735E Check
Service Diagnosis 102
5.5 Four Way Valve Performance Check
Check No.13
5.6 Inverter Unit Refrigerant System Check
Check No.14
(R21674)
NO
YES
YES
NO
Turn the power off and then on
again.
Disconnect the four way valve coil
from the connector and check the
continuity.
Start heating operation.
∗ Four way valve coil
Cooling / Dry / Defrost: Not energized
Heating: energized
Replace the outdoor unit
PCB (main PCB).
Replace the four way valve
coil.
Replace the four way valve.
Four way
valve coil resistance at
1000 ~ 2000 Ω?
S80
voltage at 208 - 230
VAC with compressor
on? (Fig. 1)
(R14674)
(Fig. 1)
Compressor
ON
Voltage at S80
208 - 230 VAC
Time
Refrigerant system check
Check for refrigerant leakage.
See the service diagnosis on
refrigerant shortage (U0).
(R15833)
YES
NO
Reconnect the thermistor.
Replace the refrigerant.
Is the
discharge pipe
thermistor disconnected
from the holder?