Code Text display Description Recommendation
A01.23 Poor Combustion Poor combustion No flame during operation:
No ionisation current:
Purge the gas supply to remove air.
Check whether the gas tap is properly open.
Checking the gas supply pressure.
Check the operation and setting of the gas
valve unit.
Check that the air inlet and flue gas dis
charge flues are not blocked.
Check that there is no recirculation of flue
gases.
A02.06 Water Press Warning Water Pressure Warning active Water pressure warning:
Water pressure too low; check the water pres
sure
A02.18 OBD Error Object Dictionary Error Configuration error:
Reset and .
A02.33 AF top comm err Auto filling top communication has
exceeded feedback time
The maximum time for refilling the system auto
matically has been exceeded:
No or low water pressure in the supply line:
check that the main water valve is fully open.
Water leakage from the boiler or system: check
the system for leaks.
Check that the maximum time for refilling is
suitable for the system: Check parameter
AP069
Check that the maximum water pressure for re
filling is suitable for this system: Check param
eter AP070. The pressure difference between
the minimum (AP006) and maximum (AP070)
water pressure must be large enough to pre
vent there being too short a time between two
filling attempts.
The valve on the automatic refill device is bro
ken: replace the device
A02.34 AF min inter err Auto filling minimum interval time
has not been reached between two
requests
The system must be refilled too quickly by the au
tomatic refill device:
Water leakage from the boiler or system: check
the system for leaks.
Latest refill did not end above the minimum wa
ter pressure because it was interrupted by the
user or because the water pressure in the sup
ply line was (temporarily) too low.
A02.36 Funct device lost Functional device has been
disconnected
SCB PCB not found:
Bad connection: check the wiring and connec
tors.
Defective SCB PCB: replace SCB PCB
A02.37 Uncritic device lost Uncritical device has been
disconnected
SCB PCB not found:
Bad connection: check the wiring and connec
tors.
Defective SCB PCB: replace SCB PCB
A02.45 Full Can Conn Matrix Full Can Connection Matrix SCB PCB not found:
Carry out an auto-detect
A02.46 Full Can Device Adm Full Can Device Administration SCB PCB not found:
Carry out an auto-detect
A02.48 Funct Gr Conf Fault Function Group Configuration Fault SCB PCB not found:
Carry out an auto-detect
11 Troubleshooting
114 AMC 7686707 - v.01 - 06092018