Mitsubishi Electric FDT125VNVF Technical Manual page 402

Error code
Indoor control PCB
E49
Remote controller:
Outdoor control PCB
Outdoor inverter
1. Applicable model
All models
2. Error detection method
3. Condition of Error displayed
4. Presumable cause
Note:
LED Green
Keeps flashing
Keeps flashing
Yellow LED or Red LED Green LED
PCB
Keeps flashing
5. Troubleshooting
From previous page.
service valve fully
connections of low
pressure sensor and suction pipe
temprerature thermister
connector OK?
characteristics of
low pressure sensor, suction
pipe temperature
thermistor 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)
Keeps flashing
Diagnosis
Is the
opened?
YES
Are the
YES
Are the
YES
YES
401
- -
'12 • PAC-T-174
Countermeasure
Open fully.
NO
Correct.
NO
Defective low pressure
NO
sensor, suction pipe
temperature thermistor ➞
Replace.
Charge refrigerant.
NO
Defective outdoor control
PCB ➞ Replace.
(Defective low pressure
sensor, suction pipe
temperature thermistor
circuits)