Daikin FTX20K(2)V1B Service Manual page 73

SiBE041525F
Troubleshooting
Check No.01
Refer to P.79
Check No.12
Refer to P.81
Check No.13
Refer to P.82
Check No.14
Refer to P.82
OL (Q1L) activating temperature: 120~130°C
Note:
OL (Q1L) recovery temperature: 95°C
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Discharge
pipe thermistor
disconnected?
NO
Check No. 01
Check the discharge pipe
thermistor.
OK
Is the
connector S40 properly
connected?
YES
Disconnect the connector S40
from the PCB.
Check
Resistance
the resistance
between the 2 terminals on
connector S40.
Nearly 0 Ω
Check No. 12
Check the electronic
expansion valve.
OK
Check No. 13
Check the four way
valve.
OK
Check No. 14
Check the refrigerant
line.
OK
YES
NG
NO
∞
Disconnect the 2 terminals of
the OL (Q1L).
Check the
resistance between the
2 terminals of the OL
(Q1L).
Nearly 0 Ω
NG
NG
NG
∗ Refrigerant shortage
∗ Water mixed
∗ Stop valve
Troubleshooting
Insert the thermistor in
position.
Replace the discharge pipe
thermistor.
Connect the connector S40
properly.
Resistance
∞
Replace the OL (Q1L).
Replace the OL harness.
Replace the electronic
expansion valve or the coil.
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).
(R22976)
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