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SiENBE12-713
Troubleshooting
Service Diagnosis
271
5.25 Insufficient Gas
Remote Control
Display
U0
Outdoor Unit LED
Display
A
5
1
1
2
1
3
4
4
4
Method of
Malfunction
Detection
Gas shortage detection I:
Gas shortage is detected by checking the input current value and the compressor running
frequency. If the gas is short, the input current is smaller than the normal value.
Gas shortage detection II:
Gas shortage is detected by checking the discharge temperature and the opening of the
electronic expansion valve. If the gas is short, the discharge temperature tends to rise.
Malfunction
Decision
Conditions
Gas shortage detection I (typical value):
The following conditions continue for 7 minutes.
$
DC current
≤
0.035 × output fre 0.5
$
Output frequency > 55 (Hz)
Gas shortage detection II:
The following conditions continue for 80 seconds.
$
Target opening of the electronic expansion valve
≥
450 (pulse)
$
Cooling: discharge temperature > 255 / 256 × target discharge tempe20 (°C)
Heating: discharge temperature > 255 / 256 × target discharge tempe40 (°C)
If a gas shortage error takes place 4 times straight, the system will be shut down. The error
counter will reset itself if this or any other error does not occur during the following 60-minute
compressor running time (total time).
Supposed
Causes
"
Refrigerant shortage (refrigerant leakage)
"
Poor compression performance of compressor
"
Discharge pipe thermistor disconnected, or indoor unit or outdoor unit heat exchanger
thermistor disconnected, room or outside air temperature thermistor disconnected
"
Stop valve closed
"
Electronic expansion valve defective
Summary of Contents for FTKS20D3VMW
Page 11: ...Introduction SiENBE12 713 x...
Page 47: ...Specifications SiENBE12 713 36 Specifications...
Page 113: ...Control Specification SiENBE12 713 102 Function and Control...
Page 235: ...Instruction SiENBE12 713 224 System Configuration...
Page 297: ...Check SiENBE12 713 286 Service Diagnosis...
Page 316: ...SiENBE12 713 Outdoor Unit Removal Procedure 305 Step Procedure Points...