E41(E51)
E41(E51)-1, 2*1
Power transistor overheat
Keeps ashing
Stays OFF
Keeps ashing
*
2
1. Applicable model
5. Troubleshooting
Outdoor unit
Diagnosis Countermeasure
2. Error detection method
E41 is displayed on 7-segment
LED.
3
.
Condition of error displayed
Anomalously high temperature
of power transistor is detected 5
times within 60 minutes (E41).
Or it is detected for 15 minutes
continuously (E51).
4. Presumable cause
• Power transistor anomaly
• Power transistor temperature
thermistor anomaly
• Inverter PCB anomaly
• Outdoor fan motor anomaly
• Anomalous cooling fan motor
for inverter
Note: *1 Measurement position: Between ① – ③ pins of CNN8
*2 Measuring position: Between + and – of C19
If it fails to repeat, connect the Mente PC, and continue to collect data.
*1 E41-1 (E51-1) : CM1, E41-2 (E51-2) : CM2 *2 E41-1 (E51-1) : 1-time ash, E41-2 (E51-2) : 2-time ash
Check, record operating condition.
Check power transistor
temperature.
Check operations of outdoor fan,
inverter cooling fan.
Have outdoor fans been running?
Reset the power supply, and restart.
After power OFF
Is inverter cooling fan running?
NO
YES
NO
YES
NO
Does it
repeat after restarting operation?
YES
NO
After power OFF
After power ON
Is power transistor characteristic OK? (＊1)
NO
YES
Are power transistor sensor
connectors connected properly? (Check short-
circuit/broken wire.)
NO
Is power transformer
attached properly? Check tightness of
screw, heat radiation silicon.
NO
Is 15V detected on inverter PCB?
(＊2)
YES
YES
YES
If it fails to run even in ON
range, check voltage at
connector (*1) on control PCB.
If AC 230V is detected,
replace inverter cooling fan.
If it shows 0V, replace
control PCB.
Inverter cooling fan runs
under following condition.
Wait and see.
(Continue, if possible, and
record data.)
OFF ON
81
℃ 85℃
Power transistor sensor temperatures 1, 2
Connect sensors securely.
Replace power transistor sensor.
Measure after confirming
that 52C or 52X is turned
ON. Replace inverter PCB.
Coat power transistor with
silicon sufficiently, and fix
on radiator fin securely.
Replace power transistor.
Save data for 30 minutes before stopping in Mente PC.
Repair according to the
troubleshooting
E48.
* See page 119 for sensor
characteristic.
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