-
277
-
10
[Power transistor is overheating] [Only case of 402~1002 models]
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
1 time flash
Keeps flashing
Outdoor unit
Error display :
E41
Compressor
operating
Compressor
stop
90
110
Power transistor temperature (˚C)
Power transistor temperature thermistor
Resistance-temperature characteristics
Is the outdoor unit’s
installation space proper?
Is it possible to reset the
error code after 10 minutes
since it occurs?
Is the outdoor unit
fan running?
Is the power transistor
temperature thermistor
connected correctly?
Are the screws to fix the power
transistor fastened tightly?
Is the silicon applied uniformly
between the power transistor
and the radiator fin?
Does it recur?
OK
Replace either the fan motor or the
outdoor unit’s control PCB.
Disconnect the outdoor unit’s fan
motor connector and run the system.
Does the
compressor run?
YES
NO
YES
YES
NO
YES
YES
YES
NO
NO
NO
Are the power transistor
temperature thermistor
characteristics OK?
YES
NO
YES
NO
NO
Correct it
properly
Replace the outdoor
unit inverter PCB
Replace the outdoor
fan motor
Replace the
thermistor.
Connect
Fasten it
correctly.
Temperature (˚C)
• Display conditions
If the power transistor temperature exceeds the
set point, the compressor stops. And when the
temperature drops to 90˚C, the compressor
restarts automatically.
The error occurs when the situation above happens
5 times within 60 minutes.
•
Set temperature for protective control
0
20
40
60
80
100
120
140
160
180
200
0
20
40
60
80
100
120
140
Thermistor resistance (k
Ω
)
