Vaillant V 10-025 NHI, Training Manual

Page: 21 / 56

Split Type Installation Manual
21 EN
Check the IPM module method:
Disconnect the compressor harness connector from the
outdoor unit PCB.
To disengage the connector, press the protrusion on the
connector.
Then, to measure resistance between P(+) andN(-) and
the U, V and W terminals of the compressor connector
with a multi-tester. Evaluate the measurement results for
a pass/fail judgment
N(-)terminal of tester P+ (for digital tester) P(+) UVW P(-) UVW
P(+)terminal of tester N- (for digital tester) UVW P(+) UVW P(-)
Normal resistance Several k� to several M� (*)
Unacceptable resistance Short (0 �) or open
7.3.4 The IPM and outdoor PCB don’t communicate or
Related Abnormality
outdoor display LED1 flash 4 times,Indoor display F11.
Service Diagnosis 7
Fig. 7.4 Flow chart.