Check SiENBE04-808_A
151 Service Diagnosis
5.1.10 Capacitor Voltage Check
Check No.12 Before this check, be sure to check the main circuit for short circuit.
With the circuit breaker still on, measure the voltage according to the drawing of the model in
question. Be careful never to touch any live parts.
5.1.11 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 with a multi-tester. Evaluate the measurement results for a
judgment.
Four way valve
lead wire
Electronic expansion valve
lead wire
Multimeter
(DC voltage range)
Reactor lead wire
Fan motor lead wire
Compressor lead wire
Thermistor lead wire
OL lead wire
(R5222)
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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