DeDietrich ALEZIO O HYBRID User Manual page 45

Error code Message
H00.51 THp Return Open
H00.52 THp Return Closed
H00.53 THp Return Missing
H00.57 T DHW Top Open
H00.58 T DHW Top Closed
H02.02 Wait Config Number
H02.03 Conf Error
H02.04 Parameter Error
H02.05 CSU CU mismatch
H02.07 Water Press Error
H02.09 Partial block
H02.10 Full Block
H02.23 System flow error
H02.25 ACI error
H02.36 Funct device lost
H02.37 Uncritic device lost
H02.60 Unsupported function
H06.01 HP Unit Failure
H06.02 BL Hydraulic Backup
H06.04 Loss Com PCU
Tab.38 List of fault codes
Fault code Message
E00.00 TFlow Open
E00.01 TFlow Closed
E00.02 TFlow Missing
7763552 - v02 - 29062020
Description
Heat pump return temperature sensor is either removed or measures a temperature
below range
Heat pump return temperature sensor is either shorted or measures a temperature
above range
Heat pump return temperature sensor was expected but not detected
Domestic Hot Water top temperature sensor is either removed or measures a
temperature below range
Domestic Hot Water top temperature sensor is either shorted or measures a
temperature above range
Central unit PCB replaced: boiler not configured.
Parameter Error
CSU does not match CU type
Water Pressure Error active
Check the hydraulic pressure in the heating circuit.
Partial blocking of the device recognized
Full blocking of the device recognized
System water flow error 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,
ACI error
Functional device has been disconnected: No communication between the central unit
PCB and the additional circuit PCB
Uncritical device has been disconnected: No communication between the central unit
PCB and the additional circuit PCB
The zone doesn't support the selected function
Heat Pump Unit Failure occured
Hydraulic Backup are blocking
Loss of the communication with the Primary Control Unit
Fault codes
If a fault code is still present after several automatic start-up attempts, the
boiler switches to error mode.
If a fault code is still present after several automatic start-up attempts, the
heat pump switches to error mode.
The boiler will only resume normal operation once the causes of the fault
have been eliminated by the installer.
The heat pump will only resume normal operation once the causes of the
fault have been eliminated by the installer.
When one of the following codes is displayed and the boiler cannot restart
automatically, contact a maintenance technician.
When one of the following codes is displayed and the heat pump cannot
restart automatically, contact a maintenance technician.
Description
Flow temperature sensor is either removed or measures a temperature below
range
Boiler flow sensor in open circuit
Flow temperature sensor is either shorted or measures a temperature above
range
Flow temperature sensor was expected but not detected
7 Troubleshooting
200 ESL HYBRID 45