Mitsubishi Heavy Industries FDUA160AVSAVH Service Manual page 102

Error code
Indoor control PCB
Remote control:
E49
Outdoor control PCB
Outdoor inverter
1. Applicable model
All models
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. And 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.
And 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:
* Connect the gauge manifold to the service valve check joint during cooling, or connect it to the check joint at internal
piping of outdoor unit during heating.
LED Green
Keeps flashing
Keeps flashing
Yellow LED
PCB
Keeps flashing
5. Troubleshooting
From previous page
service valve fully
connections of low
pressure sensor and suction pipe
temprerature sensor
connector OK?
characteristics of
low pressure sensor, suction
pipe temperature
sensor OK?
Is the low
pressure normal during
operation?
Red
Content
Stays OFF
Low pressure error or
1-time flash
low pressure sensor anomaly (2/2)
Diagnosis
Is the
opened?
YES
Are the
YES
Are the
YES
YES
101
- -
'21 • PAC-SM-398
Countermeasure
Open fully.
NO
Correct connector.
NO
Defective low pressure
NO
sensor, suction
pipe temperature
sensor➞Replace.
Charge refrigerant.
NO
Defective outdoor unit
control PCB➞Replace.
(Defective low pressure
sensor, suction pipe
temperature sensor circuits)