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Error code
Remote control:
7-segment display:
LED
Green
Red
Keep
flashing
*2
Content
–
*1
E42-1
Current cut (CM1)
5.Troubleshooting
Diagnosis
Countermeasure
Is DC15V detected
on inverter PCB?
(*3)
Check
inverter PCB for
defect with the
checker.
Save the Mente PC data of 30 minutes
before stopping
Reset the power source and restart operation
NO
NO
NO
NO
Is the
winding wire resistance and
the meggar check of motor insulation
of compressor
OK?
Is the fan of gas
cooler rotating?
Does it repeat?
Check resistance
between power transistor modules.
(Is it shortcircuited?)
(*4)
Normal
YES
YES
YES
Is there
inverter output?
NO
YES
YES
※
Refer to “Note”
Power transistor error
Other (Including
checker not available)
Short-circuited.
• Check the operation status
and record it.
• Is anomalous pressure
detected?
• Does the fan motor of gas
cooler run?
Replace compressor
If necessary, replace
capillary tube of oil
separator and strainer as
well.
Rectify it according to the
troubleshooting procedure
of E48.
Restart operation under
the operating conditions
30 minutes before error
occurred as possible as you
can.
Wait and see.
Replace compressor.
Replace power transistor.
Measure after confirming
that 52C or 52X is turned
ON.
Replace inverter PCB.
Replace power transistor.
Replace inverter PCB.
Detect the anomalous output
current of inverter
with the sensor built in the
power transistor
If the error signal (47A or
higher output current of
inverter) is detected 4 times
within 20 minutes.
4.
• Compressor anomaly
• Leak of refrigerant
• Power transistor anomaly
• Anomalous power voltage to
the inverter PCB
• Fan motor anomaly
Note: *3 Measurement position: B and - of C19 or Between pins 5-8 of PC18, 19 and 20
*4 Measurement position: Check resistance between P-U, P-V, P-W, N-U, N-V, N-W, P-N. (Disconnect compressor wires before measurement.).
If it fails to repeat, connect the Mente PC, and continue to collect data.
*1 E42-1: CM1
*2 E42-1: 1-time flash
Condensing
unit
All models
1. Applicable model
2. Error detection method
3. Condition of error displayed
4. Presumable cause
User Guide | Optyma™ iCO2
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