Daikin CTX Series Service Manual page 88

DAMA-SM-21-003
Troubleshooting
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Four way valve
coil disconnected
(loose)?
NO
Harness
disconnected?
NO
Check the continuity of the four
way valve coil and harness.
Disconnect the harness
from the connector.
Resistance
between
harnesses about
500-2300Ω
YES
Check No. 13
Check the four way valve
switching output.
OK
Any thermistor
disconnected?
NO
Check No. 01
Check the thermistors.
OK
Check No. 14
Check the refrigerant
line.
OK
YES
YES
NO
NG
YES
NG
NG
*) Refrigerant shortage
*) Water mixed
*) Stop valve
Troubleshooting
Correct the four way
valve coil.
Reconnect the
harness.
Replace the four way
valve coil.
Replace the outdoor
unit PCB (main PCB).
Reconnect the
thermistor(s).
Replace the defective
thermistor(s).
Refer to the refrigerant
line check procedure.
Replace the four way
valve (defective or
dust-clogged).
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