Code
Message
Description
H10.14
TSwimmPoolZoneBClose
Swimming Pool Temperature Sensor Zone B Closed
H10.18
T Flow Zone C Open
Flow temperature sensor Zone C Open
H10.19
T Flow Zone C Closed
Flow temperature sensor Zone C Closed
H10.20
T Dhw Zone C Open
Domestic Hot Water Temperature Sensor Zone C Open
H10.21
T Dhw Zone C Closed
Domestic Hot Water temperature sensor Zone C Closed
H10.22
TSwimmPoolZoneC Open
Swimming Pool Temperature Sensor Zone C Open
H10.23
TSwimmPoolZoneCClose
Swimming Pool Temperature Sensor Zone C Closed
H10.27
T Flow Zone DHW open
Flow temperature sensor Zone DHW open
H10.28
Sens. ZoneDHW closed
Flow temperature sensor Zone DHW closed
H10.29
Sensor Zone DHW open
Temperature sensor Zone DHW open
H10.30
T Zone DHW closed
Domestic Hot Water temperature sensor Zone DHW closed
H10.36
Sensor Zone AUX open
Flow temperature sensor Zone AUX open
H10.37
Sens. ZoneAUX closed
Flow temperature sensor ZoneAUX closed
H10.38
T Dhw Zone AUX open
Domestic Hot Water temperature sensor Zone AUX open
H10.39
Sens. ZoneAUX Closed
Domestic Hot Water temperature sensor Zone AUX closed
6.1.4
Lockout codes
A lockout code signals a major anomaly affecting the heating system: the
heating system is shut down as the safety conditions are not fulfilled.
When one of the codes below is displayed, contact the professional
responsible for maintenance of the heat pump.
Tab.24 List of lockout codes
Code
Message
Description
E00.00
TFlow Open
Flow temperature sensor is either removed or measures a temperature below range
E00.01
TFlow Closed
Flow temperature sensor is either shorted or measures a temperature above range
E02.13
Blocking Input
Blocking Input of the Control Unit from device external environment
Input BL open.
E02.24
System flow locking
System water flow locking active
Insufficient flow: open a radiator valve
The circuit is clogged:
Check that the filters are not obstructed and clean them if necessary.
Clean and flush the installation.
No circulation:
Check that the valves and thermostatic valves are open.
Check that the filters are not obstructed.
Check that the circulating pump is working.
Check the wiring.
Check the pump supply: if the pump does not work, replace it.
6.1.5
Warning codes
A warning code signals that the optimal operating conditions are not
fulfilled. The system continues to operate safely, but there is a risk of
shutdown if the situation continues to deteriorate.
If the situation improves, the warning code may disappear spontaneously.
When one of the codes below is displayed continuously, contact the
professional responsible for maintenance of the heat pump.
Tab.25 List of warning codes linked to the EHC–05 PCB
Code
Message
Description
A02.06
Water Press Warning
Water Pressure Warning active
A02.18
OBD Error
Object Dictionary Error
6 Troubleshooting
26
MIT-S
7684505 - v04 - 10022022
