Service Manual

Troubleshooting SiUS04-921
92 Service Diagnosis
Troubleshooting
Check No.02
Refer to P.141
Warning: When an air conditioner does not cool or heat the room, refrigerant leak is considered to be one of
the reasons.
Make sure that there is no gas leakage or breaks due to an over-tightened flare connection.
Though the refrigerant used in an air conditioner is itself harmless, it can generate toxic gases
when it leaks into a room and contacts flames, such as fan and other heaters, stoves, and ranges.
In case of leakage, ventilate the room immediately.
Set the temperature
properly.
Secure required space.
Arrange for a correct
combination.
Clean the air filter.
Replace with an
appropriate model or add
another machine.
Piping length is to be within
the specified range.
Replace the thermistor.
Change power supply
installation.
Check detailed operating
conditions (diagnosis by
gas pressure, operation
current).
Is the set
temperature correct?
Is the supplied voltage
correct?
(R10108)
YES
NO
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts damage may occur.
Is there the required
installation space? (It isn’t
short circuited?)
Thermostat off
Check the compatibility.
Is the indoor unit
compatible for connecting
with the outdoor unit?
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
Appropriate
NO
Is the air filter blocked?
YES
Is the load (i.e. size of
the room) appropriate
for the capacity?
Is the refrigerant piping
too long?
Too long
Check No. 02
Is the room temperature
thermistor or the outdoor
temperature thermistor in
good working order?