DAMA-SM-21-001 Troubleshooting
Service Diagnosis 70
Troubleshooting
Check No.01 Refer to P.87
Check No.12 Refer to P.88
Check No.14 Refer to P.90
When replacing the defective thermistor(s), replace the thermistor as ASSY.
YES
NO
YES
NG
NO
OK
Check the thermistors
• Connector S40
• 2 terminals of OL (Q1L)
• Discharge pipe thermistor
NG
NG applicable to FTXA/FTXC (mode)
NG
Replace the OL harness.
Replace the OL (Q1L)
OK
OK
OK
Resistance
∞
Resistance
∞
Nearly 0 Ω
Nearly 0 Ω
Discharge
pipe thermistor
disconnected?
Connectors are
properly connected?
Disconnect the connector S40
from the PCB.
Check
the resistance
between the 2 terminals on
connector S40.
Check the electronic
expansion valve.
Check the refrigerant
line.
Check the four way
valve
Disconnect the 2 terminals
of the OL (Q1L).
Check the
resistance
between the 2
terminals of the OL
(Q1L).
• Refrigerant shortage
• Water mixed
• Stop valve
Insert the thermistor in
position.
Replace the discharge pipe
thermistor.
Connect the connectors
properly.
Replace the four way valve or the
coil.
Replace the outdoor unit PCB
(main PCB).
Refer to the refrigerant line
check procedure.
Replace the outdoor unit PCB
(main PCB).
Replace the electronic expansion
valve or the coil
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
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