Problem Symptoms And Measures - Daikin 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.
Equipment operates but
does not cool, or does not
heat (only for heat pump
model).
Large operating noise and
vibrations
166
Check Item
Check the type of the indoor units. Check to make sure that the indoor unit type is
Check the outdoor air temperature. Heating operation cannot be used when the
Diagnosis with remote controller
indication
Check the remote controller
addresses.
Check the power supply.
Check the outdoor air temperature. Heating operation cannot be used when the
Diagnosis with remote controller
indication
Check for wiring and piping errors
in the indoor and outdoor units
connection wires and pipes.
Check for thermistor detection
errors.
Check for faulty operation of the
electronic expansion valve.
Diagnosis with remote controller
indication
Diagnosis 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.
compatible with the outdoor unit.
outdoor air temperature is 24°C or higher (only
for heat pump model), and cooling operation
cannot be used when the outdoor air
temperature is below 10°C.
—
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)
outdoor air temperature is 24°C or higher (only
for heat pump model), and cooling operation
cannot be used when the outdoor air
temperature is below 10°C.
—
Conduct the wiring/piping error check described
on the product diagnosis nameplate.
Check to make sure that the main unit's
thermistor has not dismounted from the pipe
holder.
Set the units to cooling operation, and compare
the temperatures of the liquid side connection
pipes of the connection section among rooms to
check the opening and closing operation of the
electronic expansion valves of the individual
units.
—
Check for refrigerant shortage.
—
—
Check to make sure that the required spaces
for installation (specified in the Engineering
Data Book Guide, etc.) are provided.
SiBE12-933_A
Reference
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Service Diagnosis