General Problem Symptoms And Check Items - Daikin FTX09NMVJU Service Manual

General Problem Symptoms and Check Items

1. General Problem Symptoms and Check Items

Symptom
The unit does not operate. Check the power supply.
Operation sometimes
stops.
The unit operates but does
not cool, or does not heat.
Large operating noise and
vibrations
61
Check Item
Check the type of the indoor unit.
Check the outdoor temperature.
Diagnose with remote controller
indication.
Check the remote controller
addresses.
Check the power supply.
Check the outdoor temperature.
Diagnose with remote controller
indication.
Check for wiring and piping errors in
the connection between the indoor
unit and outdoor unit.
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.
Details
Check if the rated voltage is supplied.
Check if the indoor unit type is compatible with the
outdoor unit.
Heating operation is not available when the outdoor
temperature is -25°CWB (-13°FWB) or higher, and
cooling operation is not available when the outdoor
temperature is below 10°CDB (50°FDB).
—
Check if address settings for the remote controller
and indoor unit are correct.
A power failure of 2 to 10 cycles stops air
conditioner operation. (Operation lamp OFF)
Heating operation is not available when the outdoor
temperature is -25°CWB (-13°FWB) or higher, and
cooling operation is not available when the outdoor
temperature is below 10°CDB (50°FDB).
—
—
Set the unit to cooling operation, and check the
temperature of the liquid pipe to see if the electronic
expansion valve works.
—
Check for refrigerant shortage.
—
—
Check if the required spaces for installation
(specified in the installation manual) are provided.
SiUS091601E
Reference
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Service Diagnosis