Mitsubishi Heavy Industries SRK100VNXPZSX Technical Manual page 150

Error code Indoor display
Remote control:
E57
Outdoor unit
Outdoor unit
inverter PCB
1. Applicable model
All models
2. Error detection method
• Judge insufficient refrigerant
amount by detecting the
temperature differnce between
indoor heat exchanger (Th2)
and indoor room (Th1).
• It detects at initial startup in
cooling or dehumidifying
mode after power ON.
3. Condition of error displayed
Anomalous stop at initial
detection
4. Presumable cause
• Defective indoor heat
exchanger temperature sensor
• Defective indoor room
temperature sensor
• Defective indoor unit control
PCB
• Insufficient refregerant
amount
Note: Insufficient refrigerant amount preventive control makes compressor stopped, if it judges insufficient refrigerant amount by detecting the
temperature difference between indoor heat exchanger (Th2) and room temperature (Th1) for 1 minute after compressor ON in cooling or
dehumidifying mode and for 9 minutes after compressor ON in heating mode. [ in cooling mode: (Th1)-(Th2)>4degC, in heating mode:
(Th2)-(Th1)<4degC]
RUN light
7-time flash
Green LED
Keeps flashing
control PCB
Yellow LED
Keeps flashing
5. Troubleshooting
service valve fully
connections of indoor
heat exchanger and/or room
temperature sensor
characteristics of indoor heat
exchanger and/or room
temperature sensor
pressure during operation
Indoor heat exchanger, room temperature sensor
Temperature-resistance characteristics
(Broken wire)
(Short circuit)
TIMER light
Content
ON
Insufficient refrigerant amount
Red LED
1-time flash
or detection of service valve closure
Diagnosis
Is the
opened?
YES
Are the
connectors OK?
YES
Are the
OK?
YES
Is the low
normal?
15
10
5k at 25°C
5
0 10 20 30 40 50
Temperature (°C)
149
- -
'17 • PAC-T-257
Countermeasure
Open fully.
NO
Correct indoor heat
NO
exchanger, room
temperature sensor
connector connections.
Defective indoor
NO
heat exchanger, room
temperature sensor ➞
Replace.
Charge refrigerant.
NO
Defective indoor control
YES
PCB ➞ Replace. (Defective
indoor heat exchanger,
room temperature sensor
input circuits)