Mitsubishi Electric FDT125VNVF Technical Manual page 447

Indoor display
Error code
E49
Remote controller:
inverter PCB
1. Applicable model
All models
2. Error detection method
3. Condition of Error displayed
4. Presumable cause
Note:
RUN light
–
Green LED
Outdoor
control PCB
Keeps flashing
Yellow LED
Outdoor
Keeps flashing
5. Troubleshooting
From previous page.
service valve fully
connections of low
pressure sensor and suction pipe
temprerature thermister
low pressure sensor, suction
pressure normal during
TIMER light
Content
–
Red LED
1 time flash
low pressure sensor anomaly (2/2)
Diagnosis
Is the
opened?
YES
Are the
connector OK?
YES
Are the
characteristics of
pipe temperature
thermistor OK?
YES
Is the low
operation?
YES
446
- -
'12 • PAC-T-174
Low pressure error or
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)