General Problem Symptoms And Check Items - Daikin CTXG09QVJUW Service Manual

SiUS121632EA

1. General Problem Symptoms and Check Items

Problem Symptom
None of the units operates. Check the power supply.
Operation sometimes
stops.
Some indoor units do not
operate.
Units operate but do not
cool, or do not heat.
Large operating noise and
vibrations
Service Diagnosis
Check Item
Check the types of the indoor units.
Check the outdoor temperature.
Diagnose with remote controller
indication
For CTXG, CTXS, FTXS, CDXS,
FDXS, FVXS series:
Check the remote controller
addresses.
For FFQ series:
Check the wireless remote controller
address.
If using 2 remote controllers for 1
indoor unit, check MAIN/SUB setting.
Check the power supply.
Check the outdoor temperature.
Diagnose with remote controller
indication.
Check the type of the indoor units.
Diagnose with remote controller
indication
Check for wiring and piping errors in
the connection between the indoor
and outdoor units.
Check for thermistor detection errors. Check if the thermistor is mounted securely.
Check for faulty operation of the
electronic expansion valve.
Diagnose with remote controller
indication.
Diagnose by service port pressure
and operating current.
Check the output voltage of the
power module.
Check the power module.
Check the installation condition.

General Problem Symptoms and Check Items

Details
Check if the rated voltage is supplied.
Check if the indoor unit type is compatible with
the outdoor unit.
Heating/cooling operations are not available
when the outdoor temperature is out of the
operation limit. Check the reference page for
the operation limit.
—
Check if address settings for the remote
controller and indoor unit are correct.
Check if address settings for the wireless
remote controller and indoor unit are correct.
Check if the MAIN/SUB setting is correct.
A power failure of 2 to 10 cycles can stop air
conditioner operation. (Operation lamp OFF)
Heating/cooling operations are not available
when the outdoor temperature is out of the
operation limit. Check the reference page for
the operation limit.
—
Check if the indoor unit type is compatible with
the outdoor unit.
—
Check the piping.
Conduct the wiring error check described on the
product diagnosis nameplate.
Set all the units to cooling operation, and
compare the temperatures of the liquid pipes to
see if the each electronic expansion valve
works.
—
Check for refrigerant shortage.
—
—
Check if the required spaces for installation
(specified in the installation manual) are
provided.
Reference
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