Mitsubishi SRK100VNXWPZSX, Service Manual

Page: 116 / 202

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115
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'20 • PAC-SM-351
E40
1. Applicable model
5. Troubleshooting
Diagnosis Countermeasure
Is the
service valve fully
opened?
YES
Has 63H1 activated?
NO
1. During cooling
・
Is the outdoor fan motor
running?
・
Isn’t any short-circuit of air on
the outdoor unit?
・
Are sufficient return air/supply air
space secured?
2. During heating
・
Isn’t the indoor heat
exchanger temperature sensor
disconnected from the sensor
casing?
・
Isn’t the filter clogged?
* Under the condition of
overcharging refirgerant, 63H1
may activate due to delay of
starting the preventive control by
compressor speed control,
because detected heat exhanger
temperature, which conducts
compressor speed control,
becomes lower than normal
condition due to excess
sub-cooling degree.
On operation
of 63H1
Is 63H1
connector connected
properly?
NO
Is the
electronic expansion
valve connector
connection
OK?
YES
YES
If the power source breaker is turned OFF and ON too quickly,
E40 may be displayed.
(This is normal.)
NO
YES
If any anomaly
exists on the
electronic
expansion valve
connector
connection, the
power source must
be reset.
NO
Open the service valve.
Correct 63H1 connector.
Correct electronic
expansion valve connector.
Defective outdoor
unit control (or main)
PCB
➞
Replace.
(Defective 63H1 input
circuit)
2. Error detection method
When the high pressure switch
63H1 is activated.
Compressor OFF
Compressor ON
3.15 4.15
High pressure (MPa)
3. Condition of error displayed
If 63H1 turns OFF (opened),
the compressor stops. After
3-minute delay, the compressor
restarts. If this anomaly occurs
5 times within 60 minutes
or continues for 60 minutes
continuously.
4. Presumable cause
• Short-circuit of air flow,
disturbance of air flow and
clogging filter at outdoor heat
exchanger/Breakdown of fan
motor
• Defective outdoor unit control
(or main) PCB
• Defective 63H1 connector
• Defective electronic
expansion valve connector
• Closed service valve
• Mixing of non-condensing gas
(nitrogen, etc.)
Note:
In the protective control range for compressor startup (initial startup after power ON), even if 63H1 is activated only once
(63H1turns OFF), immediately the error is displayed.
Error code
Remote control:
LED Green Red
Outdoor control PCB
Outdoor inverter
PCB
1-time flash Keeps flashing
Indoor control PCB Stays OFF Keeps flashing
Content
Keeps flashing
Yellow LED
High pressure error
(63H1 activated)