![background image](http://html.mh-extra.com/html/daikin/altherma-ekhbh-series/altherma-ekhbh-series_service-manual_501281128.webp)
Error Codes: System Malfunctions
ESIE06-03
3–42
3
1
3
4
5
4.2
“U0”
Insufficient Gas
Error code
U0
Method of
malfunction
detection
Gas shortage detection I:
A gas shortage is detected by checking the CT-detected input current value and the compressor
running frequency.
Gas shortage detection II:
A gas shortage is detected by checking the difference between hydro-box heat exchanger temperature
and room temperature as well as the difference between outdoor unit heat exchanger temperature and
room temperature.
Malfunction
decision conditions
Gas shortage detection I :
DC current
≤
(A/Hz) × Output fre
However, when the status of running frequency > 55 (Hz) is kept on for a certain time.
Note: The values are different from model to model.
Gas shortage detection II :
If a gas shortage error takes place 4 times successively, 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
P
Refrigerant shortage (refrigerant leakage)
P
Poor compression performance of compressor
P
Discharge pipe thermistor disconnected, or hydro-box or outdoor unit heat exchanger thermistor
disconnected, room or outside air temperature thermistor disconnected
P
Stop valve closed
P
Electronic expansion valve defective
71 class
27 / 1000
2.5
Summary of Contents for Altherma EKHBH Series
Page 2: ...ESIE06 03 1 2 Part 1 System Outline 3 1 1 5 ...
Page 26: ...Functional Diagrams ESIE06 03 1 26 Part 1 System Outline 3 1 1 4 5 ...
Page 32: ...Piping Diagrams ESIE06 03 1 32 Part 1 System Outline 3 1 1 4 5 ...
Page 38: ...Switch Box Layout ESIE06 03 1 38 Part 1 System Outline 3 1 1 4 5 ...
Page 58: ...PCB Layout ESIE06 03 1 58 Part 1 System Outline 3 1 1 4 5 ...
Page 60: ...ESIE06 03 2 2 Part 2 Functional Description 3 1 2 5 ...
Page 68: ...Hydro box Functional Concept ESIE06 03 2 10 Part 2 Functional Description 3 1 2 4 5 ...
Page 88: ...ESIE06 03 3 2 Part 3 Troubleshooting 3 1 3 5 ...
Page 134: ...Error Codes System Malfunctions ESIE06 03 3 48 Part 3 Troubleshooting 3 1 3 4 5 ...
Page 152: ...Additional Checks for Troubleshooting ESIE06 03 3 66 Part 3 Troubleshooting 3 1 3 4 5 ...
Page 154: ...ESIE06 03 5 2 Part 5 Disassembly and Maintenance 3 1 5 ...