Mitsubishi Electric PUHY-HP72 Service Handbook page 145

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
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.
The resistance value is not normal each.
Part name
Damper lock motor Measure the resistance between the terminals with a tester.
Right(ML1)
(Part temperature: 10°C ~ 30°C)
Color of the lead wire
Damper lock motor
BRN-other one
Left(ML2)
Measure the resistance between the terminals with a tester.
(Part temperature: 10°C ~ 30°C)
Damper motor
Color of the lead wire
(MV2)
BRN-other one
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 (-).
There is not 5V DC between CN1X1 (+) and (-).
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 (-).
There is not 0V DC between CN1X1 (+) and (-).
There is 5V DC between CN1X1 (+) and (-) and 0V DC between CN1X1 (+) and (-).
P.C. board.
Fuse(F11)
VARISTOR(NR11)
R111
Note: Refer also to the Service Handbook for the indoor units.
24
- chapter 7
Replace the indoor electronic control P.C. board.
Replace the motor that indicates the abnormal value.
Check method and criteria
Normal
235Ω~255Ω
Normal
282Ω~306Ω
Replace the damper limit switch (open)
Replace the damper limit switch (close)
Replace the damper limit switch (open)
Replace the damper limit switch (close)
Indoor electronic
control P.C. Board
JR06
JR05
IC101
CN1X1 CN1Y1
CN151
C111 T11
CN152
CN211
CN212
Figure
RED
ROTOR
YLW
BRN
ORN GRN
Replace the indoor electronic control
HWE18240_GB