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ESIE06-03
Error Codes: Hydro-box
3–9
4
5
1
3
2.3
“A5”
Freeze-up Protection Control or High Pressure Control
Error code
A5
Method of
malfunction
detection
P
High pressure control (heat pump model only)
During heating operations, the temperature detected by the hydro-box heat exchanger thermistor
is used for the high pressure control (stop, outdoor fan stop, etc.)
P
The freeze-up protection control (operation halt) is activated during cooling operation according to
the temperature detected by the hydro-box heat exchanger thermistor.
Malfunction
decision conditions
P
High pressure control
During heating operations, the temperature detected by the hydro-box heat exchanger thermistor
is above 65°C
P
Freeze-up protection
When the hydro-box heat exchanger temperature is below 0°C during cooling operation.
Supposed causes
P
Detection error due to faulty hydro-box heat exchanger thermistor.
P
Detection error due to faulty hydro-box PCB.
Troubleshooting
See also "Check No.06" on page 3-53.
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
Check No. 06
Hydro-box heat exchanger
thermistor check
YES
Does it
conform to the thermistor
characteristic
chart?
NO
Replace the hydro-box PCB.
Replace the thermistor (replace the
hydro-box PCB).
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 ...