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ESIE06-03
Error Codes: System Malfunctions
3–47
3
3
4
5
1
4.5
“U7”
Malfunction of Transmission between Remote Controller and Control box
Error code
U7
Method of
malfunction
detection
Communication error between microcomputer mounted on the main microcomputer and PM1.
Malfunction
decision conditions
P
When the data sent from the PM1 can not be received successively for 9 sec.
P
The abnormality is determined if the above fault conditions occurs once.
P
Fault counter is reset when the data from the PM1 can be successfully received.
Supposed causes
P
Defective outdoor unit PCB
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
Replace the outdoor unit PCB.
The cause can be an external
factor other than the
malfunction.
Monitor in long term.
NO
Error again?
YES
Turn the power off and turn it on
again.
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 ...