Mitsubishi Heavy Industries FDT100VNAWVH Service Manual page 168

Error code
Indoor display
Remote control:
E49
Outdoor unit
1. Applicable model
All models
2. Error detection method
3. Condition of error displayed
4. Presumable cause
Note:
RUN light
--
Green LED
control PCB
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
low pressure sensor anomaly (2/2)
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?
167
- -
'19 • PAC-SM-309
Low pressure error or
Countermeasure
Open fully.
NO
Correct.
NO
Defective low pressure
NO
sensor, suction pipe
temperature sensor ➞
Replace.
Charge refrigerant.
NO
Defective outdoor unit
YES
main PCB ➞ Replace.
(Defective low pressure
sensor, suction pipe
temperature sensor
circuits)