MXS Service Manual

SiUS121736EA Troubleshooting for Outdoor Unit
Service Diagnosis 194
Troubleshooting
Check No.01
Refer to P.209
Check No.13
Refer to P.213
Check No.14
Refer to P.213
NG
OK
NO
OK
NG
OK
YES
NG
Correct the four way valve
coil.
Reconnect the harness.
YES
YES
YES
NO
NO
Replace the outdoor
unit PCB (main PCB).
Replace the defective
thermistor(s).
Refer to the refrigerant line
check procedure.
Replace the four way valve
(defective or dust-clogged).
Reconnect the
thermistor(s).
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
(R20405)
∗ Refrigerant shortage
∗ Water mixed
∗ Stop valve
Four way valve coil
disconnected (loose)?
Harness disconnected?
Any thermistor
disconnected?
Check No. 01
Check the thermistors.
Check No. 14
Check the refrigerant
line.
Check No. 13
Check the four way valve
switching output.
Check the continuity of the four way
valve coil and harness.
Replace the four way
valve coil.
NO
Resistance
between harnesses about
1000 ~ 2000 Ω?
Disconnect the harness from the
connector.