Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 217

Error code
Indoor control PCB
Remote control:
E35
Outdoor control PCB
Outdoor inverter
1. Applicable model
Models FDC71-250
2. Error detection method
For the error detection method,
refer to the protective control by
controlling compressor rotation
speed and cooling high pressure
protective control of micro-
computer control function for
corresponding models.
3. Condition of error displayed
When outdoor heat exchanger
temperature anomaly is detected
5 times within 60 minutes or
this anomalous state is detected
60 minutes continuously
including compressor stop.
4. Presumable cause
• Defective outdoor heat
exchanger temperature sensor
• Defective outdoor unit control
(or main) PCB
• Indoor, outdoor unit
installation spaces
• Short-circuit of air on indoor,
outdoor units
• Fouling, clogging of heat
exchanger
• Excessive refrigerant amount
Note:
LED Green
Keeps flashing
Keeps flashing
Yellow LED
PCB
Keeps flashing
5. Troubleshooting
outdoor heat exchanger
unit operating in the
(measured actually) at
detection of error
* For the contents of control, refer to the protective control by controlling
compressor rotation speed and cooling high pressure protective control of
microcomputer control function for corresponding models.
Red
Content
Stays OFF
Cooling overload operation
1-time flash
(Models FDC71-250 only)
Diagnosis
* For the characteristics of outdoor
heat exchanger temperature sensor,
Are the
refer to E37.
characteristics of
NO
temperature sensor
normal?
YES
Is the
YES
state of cooling
overload?
NO
Is the high
pressure control
NO
normal?
YES
Is
the temperature
NO
correct?
YES
216
- -
'19 • PAC-T-327
Countermeasure
Replace outdoor heat
exchanger temperature
sensor.
Check unit side.
• Isn't the air circulation
of outdoor unit short-
circuited?
• Are installation spaces
adequate?
• Isn't there any fouling
or clogging on heat
exchanger?
Control operation check *.
Defective outdoor
unit control (or main)
PCB➞Replace.
Excessive refrigerant
amount : Recharge
refrigerant by weighing
proper amount on a scale.