Mitsubishi Heavy Industries FDUA160AVSAVH Service Manual page 91

Error code
Indoor control PCB
Remote control:
E36
Outdoor control PCB
Outdoor inverter
1. Applicable model
All models
2. Error detection method
For the error detection method,
refer to compressor overheat
protective control in the
protective control by controlling
compressor rotation speed of
microcomputer control function
for corresponding models.
3. Condition of error displayed
When discharge pipe
temperature anomaly is detected
2 times within 60 minutes or
this anomalous state is detected
60 minutes continuously
including compressor stop.
4. Presumable cause
• Defective outdoor unit control
PCB
• Defective discharge pipe
temperature sensor
• Clogged filter
• Indoor, outdoor unit
installation spaces
• Short-circuit of air on indoor,
outdoor units
• Fouling, clogging of heat
exchanger
Note:
LED Green
Keeps flashing
Keeps flashing
Yellow LED
PCB
Keeps flashing
5. Troubleshooting
discharge pipe temperature
temperature error persisted
discharge pipe temperature
temperature (measured
actually) at detection of
* For the contents of control, refer to compressor overheat protective control in
the protective control by controlling compressor rotation speed of
microcomputer control function for corresponding models.
Red
Content
Stays OFF
1-time flash
Diagnosis
* For the characteristics of discharge
Are the pipe temperature sensor, refer to E39.
characteristics of
sensor
normal?
YES
Is the
discharge pipe
during cooling /heating
operation?
NO
Is the
control normal?
YES
Is the
error correct?
90
- -
'21 • PAC-SM-398
Discharge pipe
temperature error
Countermeasure
Replace discharge pipe
NO
temperature sensor.
Insufficient refrigerant
YES
amount : Recharge
refrigerant by weighing
proper amount on a scale.
Control operation check *
NO
Defective outdoor unit
NO
control PCB➞Replace.
Check unit side:
YES
• Isn't filter clogged?
• Are indoor, outdoor
unit installation spaces
adequate?
• Isn't there any short-
circuit of air?
• Isn't there any fouling,
clogging on indoor heat
exchanger?