SiBE041010 Check
Service Diagnosis 95
5.1.8 Inverter Units Refrigerant System Check
Check No.11
5.1.9 Power Module 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 connector with a multi-tester. Evaluate the measurement
results for a judgment.
Refrigerant system check
Check for refrigerant leaks.
See the service diagnosis on
refrigerant shortage (U0).
(R8259)
YES
NO
Place the thermistor.
Replace the refrigerant.
Is
the discharge
thermistor disconnected
from the holder?
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 kΩ ~ several MΩ
Resistance in NG 0 Ω or ∞
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