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SiUS121827E General Problem Symptoms and Check Items
Part 6 Service Diagnosis 145
1. General Problem Symptoms and Check Items
Symptom Check Item Details
Reference
Page
None of the units
operates.
Check the power supply. Check if the rated voltage is supplied. —
Check the types of the indoor
units.
Check if the indoor unit type is
compatible with the outdoor unit.
—
Check the outdoor temperature. Heating/cooling operations are not
available when the outdoor temperature
is out of the operation limit. Check the
reference page for the operation limit.
292
Diagnose with remote controller
indication
— 162, 163
For RA Indoor Unit:
Check the wireless remote
controller addresses.
Check if address settings for the wireless
remote controller and indoor unit are
correct.
258
For SA Indoor Unit:
Check the wireless remote
controller addresses.
If using 2 remote controllers for
1 indoor unit, check MAIN/SUB
setting.
Check if address settings for the wireless
remote controller and indoor unit are
correct.
Check if the MAIN/SUB setting is
correct.
192, 193
Operation sometimes
stops.
Check the power supply. A power failure of 2 to 10 cycles can stop
air conditioner operation. (Operation
lamp OFF)
—
Check the outdoor temperature. Heating/cooling operations are not
available when the outdoor temperature
is out of the operation limit. Check the
reference page for the operation limit.
292
Diagnose with remote controller
indication.
— 162, 163
Some indoor units do
not operate.
Check the type of the indoor
units.
Check if the indoor unit type is
compatible with the outdoor unit.
—
Diagnose with remote controller
indication
— 162, 163
Units operate but do not
cool, or do not heat.
Check for wiring and piping
errors in the connection
between the indoor and outdoor
units.
Check the piping.
Conduct the wiring error check described
on the product diagnosis nameplate.
—
Check for thermistor detection
errors.
Check if the thermistor is mounted
securely.
—
Check for faulty operation of the
electronic expansion valve.
Set all the units to cooling operation, and
compare the temperatures of the liquid
pipes to see if the each electronic
expansion valve works.
—
Diagnose with remote controller
indication.
— 162, 163
Diagnose by service port
pressure and operating current.
Check for refrigerant shortage.
195
Large operating noise
and vibrations
Check the output voltage of the
power module.
— 245
Check the power module. — —
Check the installation condition. Check if the required spaces for
installation (specified in the installation
manual) are provided.
—
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