Daikin FTXN15KVJU - Power Module Check

Check SiUS041111
126 Service Diagnosis
15/18/24 class
5.13 Power Module Check
Check No.22
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.
Tester
–~~+
1234
–
+
(R14433)
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 ~ several M
Resistance in NG 0  or 