General Problem Symptoms And Check Items - Daikin MKS-T Series Service Manual

General Problem Symptoms and Check Items

1. General Problem Symptoms and Check Items

Symptom
None of the units operates.
Operation sometimes stops. Check the power supply.
Some indoor units do not
operate.
Units operate but do not
cool.
Large operating noise and
vibrations
103
Check Item
Check the power supply.
Check the types of the indoor units.
Check the outdoor temperature.
Diagnose with remote controller
indication
Check the remote controller
addresses.
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 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.
Cooling operation is 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.
A power failure of 2 to 10 cycles can stop air
conditioner operation. (Operation lamp OFF)
Cooling operation is 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 wiring and piping.
Conduct the wiring error check.
Check if the thermistor is mounted securely.
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.
SiSG121917E
Reference Page
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218
114
191
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218
114
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114
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114
138
179
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Part 6 Service Diagnosis