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Check
SiBE12-933_A
218
Service Diagnosis
5.1.9 Inverter Units Refrigerant System Check
Check No.11
5.1.10 Power Transistor Check
Check No.13
Note:
Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx.
0 V before checking.
Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the
connector, press the protrusion on the connector.
Follow the procedure below to measure resistance between the terminals of the DB1 and
the terminals of the compressor with a multi-tester. Evaluate the measurement results for a
judgment.
(R8428)
Refrigerant system check
NO
Is the discharge
thermistor
disconnected from the
holder?
Is the
temperature of
the four way valve
suction pipe
abnormally high?
Check for refrigerant leakage.
See the section on refrigerant
shortage detection.
NO
YES
YES
Correct the problem.
Four way valve defective.
Replace the four way valve.
Replace the refrigerant.
Negative (–) terminal of
tester (positive terminal
(+) for digital tester)
DB1 (+)
UVW
DB1 (–)
UVW
Positive (+) terminal of
tester (negative terminal
(–) for digital tester)
UVW
DB1 (+)
UVW
DB1 (–)
Resistance in OK
several k
Ω
~ several M
Ω
Resistance in NG
0
Ω
or
∞