Daikin 3MKS50E3V1B Service Manual page 291

SiBE121135
Troubleshooting
Check No.01
Refer to P.325
Check No.06
Refer to P.327
Service Diagnosis
Troubleshooting for RA Indoor Unit - FTXG, FTXS, CTXS, FVXG, FVXS, FLXS, FDXS Series
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check the operation condition.
Condition OK?
YES
Check No. 06
Check the indoor electronic
expansion valve coil.
OK?
YES
Check No. 01
·Radiant panel thermistors
·Indoor heat exchanger thermistor
·Room temperature thermistor
Does it
conform to the
thermistor characteristic
chart?
YES
Check the air passage.
Is there any short
circuit?
NO
Check the air filter.
Is it very dirty?
NO
Check the indoor heat exchanger.
Is it very dirty?
NO
Change the refrigerant to remove
moisture from the piping (after
drawing a vacuum).
Error repeats?
YES
Replace the indoor unit PCB.
Error repeats?
YES
∗
When the outdoor temperature is below the
lower limit for cooling operation (10˚C), the
freeze-up protection control is activated and the
cooling operation stops.
NO
NO
NO
YES
YES
YES
NO
NO
Start operation within the
specified range of the outdoor
temperature.
Replace the indoor electronic
expansion valve coil.
Replace the thermistor.
·Radiant panel thermistors
·Indoor heat exchanger
thermistor
·Room temperature thermistor
Provide sufficient air passage.
Clean the air filter.
Clean the indoor heat
exchanger.
Completed.
Completed.
Replace the indoor heat
exchanger.
(R14647)
279