Daikin FTK Series Service Manual page 91

DAMA-SM-21-001
Troubleshooting
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
Four way valve
YES
coil disconnected
(loose)?
NO
Harness
YES
disconnected?
NO
Check the continuity of the four
way valve coil and harness.
Disconnect the harness
from the connector.
Resistance
NO
between
harnesses about
500-2300Ω
YES
Check No. 13
NG
Check the four way valve
switching output.
OK
Any thermistor
disconnected?
NO
Check No. 01
Check the thermistors.
OK
Check No. 14
NG
Check the refrigerant
line.
OK
YES
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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