Daikin FTX-N Series Service Manual page 160

Troubleshooting for Outdoor Unit
Troubleshooting
Note
OL (Q1L) activating temperature: 120 ~ 130°C (248 ~ 266°F)
OL (Q1L) recovery temperature: 95°C (203°F)
Reference
Check No.01 Refer to P.181
Reference
Check No.12 Refer to P.184
Reference
Check No.13 Refer to P.185
155
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.
Resistance
Check the
resistance between the 2
terminals on connector
S40.
Nearly 0 :
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
f
Disconnect the 2 terminals of
the OL (Q1L).
Check the
resistance between the 2
terminals of the OL
(Q1L).
Nearly 0 :
NG
NG
NG
Refrigerant shortage
Water mixed
Stop valve
SiUS091601EA
Insert the thermistor in
position.
Replace the discharge pipe
thermistor.
Connect the connector S40
properly.
Resistance
f
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).
Part 6 Service Diagnosis
(R22997)