Mitsubishi Heavy Industries SRK100VNXWZRF Service Manual page 129

Error code Indoor display
Remote control:
E49
Outdoor unit
Outdoor unit
inverter PCB
1. Applicable model
Model FDC100VN(S)X-W,
100VN(S)A-W, 200VSA-W
2. Error detection method
Detected by low pressure drop
and suction superheat
3. Condition of error displayed
➀ When the low pressure sensor
detects 0.079MPa or lower
for 15 seconds continuously,
compressor stops and it
restarts automatically after
3-minute delay, but if this
anomaly occurs 5 times
within 60 minutes.
➁ 10 minutes after the
compressor starts, if the
low pressure sensor detects
0.15MPa or lower for 60
seconds continuously and
compressor suction superheat
is detected 30degC or higher
for 60 seconds continuously,
but if this anomaly occurs 5
times within 60 minutes.
➂ If low pressure sensor
detects 0.079MPa or lower
for 5 minutes continuously
(Including the compressor
stop status)
4. Presumable cause
• Defective outdoor unit control
PCB
• Defective low pressure sensor
connector
• Defective low pressure sensor
• Defective suction pipe
temperature sensor connector
• Defective suction pipe
temperature sensor
Note:
RUN light
–
Green LED
Keeps flashing
control PCB
Yellow LED
Keeps flashing
5. Troubleshooting
From previous page
service valve fully
connections of low
pressure sensor and suction pipe
temprerature sensor
low pressure sensor, suction
pressure normal during
TIMER light
Content
–
Red LED
(Models FDC100VN(S)X-W, 100VN(S)A-W,
1-time flash
Diagnosis
Is the
opened?
YES
Are the
connector OK?
YES
Are the
characteristics of
pipe temperature
sensor OK?
YES
Is the low
operation?
128
- -
'22 • PAC-SM-422
Low pressure error or
low pressure sensor anomaly (2/2)
200VSA-W only)
Countermeasure
Open fully.
NO
Correct connector.
NO
Defective low pressure
NO
sensor, suction
pipe temperature
sensor➞Replace.
Charge refrigerant.
NO
Defective outdoor unit
YES
control PCB➞Replace.
(Defective low pressure
sensor, suction pipe
temperature sensor circuits)