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Check
code
Check
code
Block
Indoor PC
board
Refrigerant
system
Table 9-2-4
Condition
Indicated when
detected abnormal
Indicated when
detected abnormal
Indicated when
detected abnormal
Indicated when
detected abnormal
Indicated when
detected abnormal
Judgment and action
1. Check thermo sensor.
2. If it is OK, check PC board.
1. Check heat exchanger
sensor.
2. If it is OK, check PC board.
1. Disconnect the power plug
from AC outlet, and pull out
the connector (CN10) for the
motor, then connect the plug
of AC power cord again and
turn the power on.
2. Check the voltage between
pin 1 and 2 of the connector
(CN10).
3. If the output voltage is 35V,
PC board is OK, check
motor.
Replace PC board.
1. Check gas quantity.
(check gas leakage)
2. If it is OK, check heat
exchanger sensor.
3. If heat exchenger sensor is
OK. check overload relay and
thermostat for compressor.
4. If overload relay is OK, check
refrigerant cycle.
5. If refrigerant cycle is OK,
check PC board.
Diagnosis functionBlock level
Symptom
Thermo sensor
short/break.
Heat exchanger
sensor short/break.
Indoor fan lock,
abnormality of
indoor fan.
Abnormality of
other indoor unit PC
board.
1) Gas shortage.
(gas leak)
2) Other refrigerant
cycle trouble.
3) Heat exchanger
sensor off/break/
short.
4) Overload relay
Air
Conditioner
status
Continued
operation
Continued
operation
All off
All off
All off
Contents detected by the check codes “ ” to “ ” are stored in memory of the microcomputer even if the power
supply is turned off. Therefore, contents of operations in the past are all displayed.