Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 205

Inverter packaged air conditioner
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Error code
E8
Remote control:
1. Applicable model
All models
2. Error detection method
Indoor heat exchanger
temperature sensor (Thi-R1, R2,
R3)
3. Condition of error displayed
When it is detected 5 times
within 60 minutes from initial
detection or when the overload
condition is detected for 6
minutes continuously.
4. Presumable cause
• Clogged air filter
• Defective indoor heat
exchanger temperature sensor
connector
• Defective indoor heat
exchanger temperature sensor
• Anomalous refrigerant system
Note:
During heating operation; After starting compressor, compressor rotation speed is decreased by detecting indoor heat
exchanger temperature (Thi-R) in order to control high pressure.
LED
Green
Red
Keeps flashing 1-time flash
Indoor
Keeps flashing Stays OFF
Outdoor
5. Troubleshooting
Diagnosis
NO
Is the air filter clogged?
Is the
indoor heat exchanger
temperature sensor
connection OK?
YES
(2)
Are the
characteristics of indoor
heat exchanger temperature
sensor OK?
YES
Check the error data with the
remote control.
Is the unit
operating in the state of
heating overload?
Note (1) Judge if it is in the state of overload or not as follows.
Is there any short-circuit of air?
Isn't there any fouling or clogging on the indoor heat exchanger?
Is the outdoor fan control normal?
Isn't the room and outdoor air temperature too high?
Note (2) For characteristics of indoor heat exchanger temperature sensor,
see the error display E6.
Reset
56      63
Indoor heat exchanger temperature (°C)
204
-
Content
Heating overload operation
YES
NO
NO
NO
YES
Error stop
-
'19 • PAC-T-327
Countermeasure
Wash.
Defective indoor heat
exchanger temperature
sensor connector ➞ Correct.
Defective indoor heat
exchanger temperature
sensor.
Check refrigerant system.
Adjust.

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