General Problem Symptoms And Check Items - Daikin FTX20K(2)V1B Service Manual

SiBE041525F

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
Service Diagnosis
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.

General Problem Symptoms and Check Items

Measures
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 18°CWB or higher, and
cooling operation is not available when the
outdoor temperature is below –10°CDB.
—
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 18°CWB or higher, and
cooling operation is not available when the
outdoor temperature is below –10°CDB.
—
—
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.
Reference
Page
—
—
—
49
93
—
—
49
—
—
—
49
—
88
—
—
44