MXS Service Manual

Check SiUS121736EA
213 Service Diagnosis
8.6 Four Way Valve Performance Check
Check No.13
8.7 Inverter Unit Refrigerant System Check
Check No.14
(R21936)
NO
YES
YES
NO
Turn off the power. Then, turn on
the power to restart the system.
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
Is the discharge pipe
thermistor disconnected from
the holder?
Check for refrigerant leakage.
See the section on refrigerant
shortage detection.
(R18870)
YES
NO
Reconnect the thermistor.
Replace the refrigerant.