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Code Display text Description Solution
A.02.33 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 parame
ter AP069.
Check that the maximum water pressure for re
filling is suitable for this system: Check param
eter AP070.
Important
The pressure difference between the
minimum (parameter AP006) and
maximum (parameter AP070) water
pressure must be high enough to pre
vent there being too short a time be
tween two filling attempts.
The valve on the automatic (re)filling unit is
faulty: Replace the unit.
A.02.34 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 (re)filling unit:
Water leakage from the boiler or system: check
the system for leaks.
Latest refill ended just 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.
A.02.36 Funct device lost Functional device has been discon
nected
SCB not found:
Bad connection: check the wiring and connec
tors
Faulty SCB: Replace SCB
A.02.37 Uncritic device lost Uncritical device has been discon
nected
SCB not found:
Bad connection: check the wiring and connec
tors
Faulty SCB: Replace SCB
A.02.45 Full Can Conn Matrix Full Can Connection Matrix SCB not found:
Carry out an auto-detect
A.02.46 Full Can Device Adm Full Can Device Administration SCB not found:
Carry out an auto-detect
A.02.48 Funct Gr Conf Fault Function Group Configuration Fault SCB not found:
Carry out an auto-detect
A.02.49 Failed Init Node Failed Initialising Node SCB not found:
Carry out an auto-detect
A.02.55 Inval or miss SerNR Invalid or missing device serial num
ber
Contact your supplier.
A.02.69 Fair mode active Fair mode active Contact your supplier.
A.02.76 Memory full The reserved space in memory for
custom parameters value is full. No
more user changed possible
Configuration error:
Reset CN1 and CN2
Faulty CSU: Replace CSU
Replace the CU-GH
10 Troubleshooting
7684359 - v.11 - 13122021 57
57


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