MXS Service Manual

Troubleshooting for Outdoor Unit SiUS121736EA
189 Service Diagnosis
Troubleshooting
Check No.01
Refer to P.209
Check No.12
Refer to P.212
Check No.13
Refer to P.213
Check No.14
Refer to P.213
Note: OL (Q1L) activating temperature: 130°C (266°F)
OL (Q1L) recovery temperature: 95°C (203°F)
(R22970)
Caution
YES
NG
NO
OK
OK
NG
NG
OK
YES
NO
NG
OK
∗ Refrigerant shortage
∗ Water mixed
∗ Stop valve
Disconnect the connector S40
from the PCB.
Disconnect the 2 terminals of
the OL (Q1L).
Resistance
∞
Resistance
∞
Nearly 0 Ω
Nearly 0 Ω
Insert the thermistor in
position.
Replace the discharge pipe
thermistor.
Replace the electronic
expansion valve or the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB (main PCB).
Replace the four way valve
or the coil.
Replace the outdoor unit
PCB (main PCB).
Discharge
pipe thermistor
disconnected?
Check No. 01
Check the discharge pipe
thermistor.
Check No. 13
Check the four way
valve.
Check No. 14
Check the refrigerant
line.
Check No. 12
Check the electronic
expansion valve.
Replace the OL (Q1L).
Replace the OL harness.
Connect the connector S40
properly.
Is the connector
S40 properly connected?
Check
the resistance
between the 2 terminals on
connector S40.
Check the
resistance between the
2 terminals of the OL
(Q1L).
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.