(R7149)
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts damage may occur.
YES
Malfunctioning
NO
NO
YES
YES
YES
NO
Functioning
YES
NO
NO
YES
NO
NO
YES
* Discharge pipe thermistor
* Indoor / outdoor unit heat exchanger thermistor
* Room temperature thermistor
* Outdoor air thermistor
Check for refrigerant leakage.
Change for a specified amount of
fresh refrigerant.
Check No. 04
Electronic expansion valve
functioning?
Replace in position.
Open the stop valve.
Repair the pipe flare or
replace the square union.
Check the power transistor
harness for looseness.
Correct it as required. Also
replace cracked pipe if any.
Check the pipes for
improper contact. Correct as
required. Also replace
cracked pipe if any.
Replace the electronic
expansion valve.
Replace the room
temperature or outdoor air
thermistor, or the indoor unit
or outdoor unit heat
exchanger thermistor.
(1) Replace the PCB.
(2) Replace the compressor
Procedure complete
Refrigerant
shortage error again?
Oil oozing at
internal piping?
Stop valve
closed?
Compressor
vibrating too much?
Oil oozing at
relay pipe connections?
Any thermistor
disconnected?
Check No. 06
Check the thermistors.
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