Mitsubishi Electric PUHY-HP120TNU-A, Service Handbook, Page: 145 / 324

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
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- chapter 7 HWE18240_GB
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7-6-7 Error Code [4124]
1. Error code definition
Electric system not operate due to damper abnormality
2. Error definition and error detection method
When the damper is not located at the designated position.
3. Cause, check method and remedy
When the damper is not located at the designated position.
1) Check there is something that interferes the opening or closing movement of the damper.
2) If damper does not open or close, turn OFF the power supply and measure the resistance of the damper lock motors (ML1,
ML2) and the damper motor (MV2).
The resistance value is normal each.
ĺ
Replace the indoor electronic control P.C. board.
The resistance value is not normal each.
ĺ
Replace the motor that indicates the abnormal value.
3) If damper opens or closes, measure the voltage between CN1X1 (+) and (-) and the voltage between CN1Y1 (+) and (-) during
the damper open by pressing VANE CONTROL button.
There is not 0V DC between CN1X1 (+) and (-).
ĺ
Replace the damper limit switch (open)
There is not 5V DC between CN1X1 (+) and (-).
ĺ
Replace the damper limit switch (close)
4) If damper opens or closes and voltages in 3) are normal, measure the voltage between CN1X1 (+) and (-) and the voltage
between CN1Y1 (+) and (-) during the damper close by pressing VANE CONTROL button.
There is not 5V DC between CN1X1 (+) and (-).
ĺ
Replace the damper limit switch (open)
There is not 0V DC between CN1X1 (+) and (-).
ĺ
Replace the damper limit switch (close)
There is 5V DC between CN1X1 (+) and (-) and 0V DC between CN1X1 (+) and (-).
ĺ
Replace the indoor electronic control
P.C. board.
Note: Refer also to the Service Handbook for the indoor units.
Part name Check method and criteria Figure
Damper lock motor
Right(ML1) Measure the resistance between the terminals with a tester.
(Part temperature: 10°C ~ 30°C)
Color of the lead wire Normal
BRN-other one 235Ω~255Ω
Damper lock motor
Left(ML2)
Damper motor
(MV2)
Measure the resistance between the terminals with a tester.
(Part temperature: 10°C ~ 30°C)
Color of the lead wire Normal
BRN-other one 282Ω~306Ω
RED
YLW
BRN
ORN
ROTOR
GRN
CN151
Indoor electronic
control P.C. Board
JR06
JR05
IC101
CN1X1 CN1Y1
CN152
CN211
CN212
Fuse(F11)
VARISTOR(NR11)
R111
C111 T11