E57 Insufficient Refrigerant Amount Or Detection Of Service Valve Closure - Mitsubishi Electric FDF100VSXVD Technical Manual

Error code
E57
Remote controller:
1. Applicable model
All models
2. Error detection method
• Judge insufficient refrigerant
amount by detecting the
temperature differnce between
indoor heat exchanger (ThI-R)
and indoor return air (ThI-A).
• It detects at initial startup in
cooling or dehumidifying
mode after power ON.
(In case of model 71 it cannot
detect)
3. Condition of Error displayed
amount is detected 3 times
within 30 minutes.
(In case of Models 100 〜 250 it
makes anomalous stop at initial
detection)
4. Presumable cause
• Defective indoor heat
exchanger temperature
thermistor
• Defective indoor return air
temperature thermistor
• Defective indoor control PCB
• Insufficient refregerant
amount
temperature difference between indoor heat exchanger (ThI-R) and return air temperature (ThI-A) for 1 minute after compressor ON in
cooling or dehumidifying mode and for 9 minutes after compressor ON in heating mode. [ in cooling mode: (ThI-A)-(ThI-R)>4degC, in
heating mode: (ThI-R)-(ThI-A)<4degC]
LED Green Red
Indoor Keeps flashing Stays OFF
Outdoor Keeps flashing 1 time flash
5. Troubleshooting
Diagnosis
service valve fully
connections of indoor
heat exchanger and/or return air
temperature thermistor
characteristics of indoor heat
exchanger and/or return air
temperature thermistor
pressure during operation
Indoor heat exchanger, return air temperature thermistor
Temperature-resistance characteristics
(Broken wire)
15
10
5
(Shot circuit)
0
193
–
Content
or detection of service valve closure
Is the
NO
opened?
YES
Are the
NO
connectors OK?
YES
Are the
NO
OK?
YES
Is the low
NO
normal?
YES
5k at 25°C
10 20 30 40 50
Temperature (°C)
–
'11 • PAC-T-160
Countermeasure
Open fully.
Correct indoor heat
exchanger, return air
temperature thermistor
connector connections.
Defective indoor heat
exchanger, return air
temperature thermistor
Replace.
Charge refrigerant.
Defective indoor control
PCB Replace. (Defective
indoor heat exchanger,
return air temperature
thermistor input circuits)