4. Troubleshooting
Method for judgement of failure of Fan Module (Inverter)
SMGB0082 rev.1 - 07/2015
120
4.8
Method for judgement of failure of Fan Module (Inverter)
This judgement method allows fault diagnosis of the components on the main circuits inside the Fan Module.
1
Before conducting this operation, please turn OFF the main switches of the air conditioner, and confirm that the LED
on the Fan controller (Red) is OFF. Please confirm this. There is the risk to receive an electric shock, since a voltage
higher than DC50V remains in the Fan controller while LED501 is ON.
2
Remove all the wiring from the Fan Module, and measure the resistance of each terminal using an analogue tester.
The terminals to measure and the judgement values are shown in the table below (measure adjusting the range of
the analogue tester to kΩ). Since this measurement method takes polarity into account, please adjust the colours and
terminals of the tester probe as shown in the table. Accurate values cannot be measured with a digital tester. Please
measure with an analogue tester.
Tester Probe
Red (+) — Black (-)
Resistance Criteria
P2 - R
P2 - S
P2 - T
R - N
S - N
T - N
P2 - U
P2 - V
P2 - W
U - N
V - N
W - N
1kΩ or greater
R - P2
S - P2
T - P2
N - R
N - S
N - T
U - P2
V - P2
W - P2
N - U
N - V
N - W
Resistance value increases gradu
-
ally after the needle moves for a
moment.
Resistance value increases
gradually after indicating
1700kΩ~1900kΩ. (*)
(*) Leave a time longer than 30 seconds between the
measurement of each terminal. In case of measuring the
next terminal without leaving enough time, resistance value
may be indicated with a higher value.
Setting status of the DSW
DSW1
1
2
3
4
FANM1
OFF
OFF
OFF
OFF
FANM2
OFF
ON
OFF
OFF
FANM3
OFF
OFF
ON
OFF
FANM4
OFF
ON
ON
OFF
N O T E
Do not change the DSW settings from their default status.
Transmission could become not possible, and damage
could be produced to the Fan Module.
DSW1
T
