INSTALLATION INSTRUCTION
56
Fault Codes
ERRORS ON THE MASTER BOARD
The following tables provide a description of the errors that may occur on the Master board.
The errors can be divided into two groups:
- Type A errors, which can only be deactivated by pressing RESET (see ref. 3 on page 18).
- Type E errors, which are deactivated when the causes are no longer present.
Permanent errors, TYPE A
Errors deactivated automatically, TYPE E
The following errors may occur, and can be deactivated automatically.
If any one of these errors occurs, the red LED comes on (see ref. 4 on page 18).
ERRORS ON THE SLAVE BOARD
List of slave errors: manual reset (see ref. 3 on page 18)
If slave errors with manual reset occur, the Slave reset button can be used (see ref. 13 on page 18).
N° N° on PC Cause Checks and solutions
A16 10 Internal error Replace the master board
A18 12 Internal error Replace the master board
A20 14 Internal error Replace the master board
N° N° on PC Cause Checks and solutions
E25 0 Internal error Replace the master board
E23 28 Internal error Replace the master board
E24 29 Internal error Replace the master board
E25 30 Internal error Replace the master board
E26 31 Internal error Replace the master board
E32 33 Slave boards not found
Check that the two-pole switches on the individual units are in the “ON”
position
Check the slave board addresses
Check the slave board bus connections
Replace the master board
Replace the slave board
E34 42 Internal 50Hz error The mains frequency is not 50Hz
E02 51 NTC1 open (NTC1: outlet sensor) Outlet sensor in the primary circuit not connected or faulty
E04 53 NTC3 open (NTC3: DHW sensor) DHW sensor not connected or faulty
E18 67 NTC1 shorted (NTC1: outlet sensor) Outlet sensor in the primary circuit short-circuited
E20 69 NTC3 shorted (NTC3: DHW sensor) DHW sensor short-circuited
N° N° on PC Cause Checks and solutions
A01 1 5 failed ignition attempts
Check that the gas valve is open. Check the presence of sparks be-
tween the two ignition electrodes
Check the ignition cable
The gas valve is not opening
Replace the slave board
Check that the fl oat in the siphon is not jammed
Check that the module is not full of condensation
Check that the gas shut-off valve has not tripped
A02 2
Too many ignition failures caused by
fl ame ionisation problems
Clean the ignition electrodes
Replace the ignition electrodes
Replace the ignition cable
A04 4
Water side maximum temperature
thermostat tripped (> 90°C). Board
version 43
Insuffi cient circulation in the primary circuit
Faulty maximum temperature thermostat
A05 5
Gas valve coil faultyFalse contact in the
gas valve connector. Faulty gas valve
connector. Water side maximum tem-
perature thermostat tripped (> 90°C)
with burner on
Replace the gas valve
Check the gas valve connector
Replace the gas valve connector
Insuffi cient circulation in the primary circuit
Faulty maximum temperature thermostat
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