Mitsubishi SRK100VNXWPZSX, Service Manual

Page: 155 / 202

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154
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'20 • PAC-SM-351
E36
1. Applicable model
5. Troubleshooting
All models
Diagnosis Countermeasure
* For the contents of control, refer to compressor overheat protective control
in the protective control by controlling compressor rotation speed of micro
computer control function for corresponding models.
Are the
characteristics of
discharge pipe temperature
sensor normal?
Is the
discharge pipe temperature
control normal?
NO
YES
Is the
temperature (measured
actually) at detection of
error correct?
YES
YES
Is the
discharge pipe
temperature error persisted
during cooling/heating
operation?
NO
* For the characteristics of discharge
pipe temperature sensor, refer to E39.
YES
NO
NO
Replace discharge pipe
temperature sensor.
Insufficient refrigerant
amount : Recharge
refrigerant by weighing
proper amount on a scale.
Control operation check *
Defective outdoor unit
control PCB
➞
Replace.
Check unit side:
• 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?
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
micro computer 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:
Error code
Remote control:
Content
1-time flash Keeps flashing
Keeps flashing
5-time flash ON
Indoor display
RUN light TIMER light
Green LED
Yellow LED
Red LED
Outdoor unit
control PCB
Outdoor unit
inverter PCB
Discharge pipe
temperature error