Problem Symptoms And Measures - Daikin SUPER MULTI NX G Series Service Manual

Problem Symptoms and Measures

2. Problem Symptoms and Measures

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
93
Check Item
Check the type of the indoor units.
Check the outdoor temperature.
Diagnose with outdoor unit LED
indication
Check the remote controller
addresses.
Check the power supply.
Check the outdoor temperature.
Diagnose with outdoor unit LED
indication.
Check the type of the indoor units.
Diagnose with outdoor unit LED
indication
Check for wiring and piping errors in
the connection between the indoor
and outdoor units.
Check for thermistor detection errors. Check to make sure that the thermistor is
Check for faulty operation of the
electronic expansion valve.
Diagnose with outdoor unit LED
indication.
Diagnose by service port pressure
and operating current
Check the output voltage of the
power transistor.
Check the power transistor.
Check the installation condition.
Details of Measure
Check to make sure that the rated voltage is
supplied.
Check to make sure that the indoor unit type is
compatible with the outdoor unit.
Heating operation cannot be used when the
outdoor temperature is 15.5°C (59.9°F) or
higher, and cooling operation cannot be used
when the outdoor temperature is below
–10°C (14°F).
—
Check to make sure that address settings for
the remote controller and indoor unit are
correct.
A power failure of 2 to 10 cycles can stop air
conditioner operation. (Operation lamp OFF)
Heating operation cannot be used when the
outdoor temperature is 15.5°C (59.9°F) or
higher, and cooling operation cannot be used
when the outdoor temperature is below
–10°C (14°F).
—
Check to make sure that the indoor unit type is
compatible with the outdoor unit.
—
Conduct the wiring/piping error check described
on the product diagnosis nameplate.
mounted securely.
Set all the units to cooling operation, and
compare the temperatures of the liquid pipes to
see the each electronic expansion valve works.
—
Check for refrigerant shortage.
—
—
Check to make sure that the required spaces
for installation (specified in the installation
manual, etc.) are provided.
SiUS12-928_A
Reference
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Service Diagnosis