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14.1 ADJUSTING MAXIMUM HEATING POWER
The maximum heating power of the boiler can be reduced to suit the requirements of the heating system it serves. A table showing
parameter P13 values according to the desired maximum power model is shown below for each single boiler
To access and edit parameter P13 values, proceed as described in the PARAMETER SETTINGS section.
Boiler model - PARAMETER P13 (%) / Heating output (kW)
kW
28/33
0
5
6
4
7
7
8
11
14
9
10
18
12
25
32
14
16
39
46
18
20
54
61
22
24
68
26
75
28
80
15. TROUBLESHOOTING SERVICE FAULTS
The faults shown on the display are identified with the symbol
following table.
If
appears on the display the fault must be RESET by the user.
To RESET the boiler, press and hold down
Description of fault
10
External probe sensor faulty
12
Hydraulic differential pressure switch switching failure
13
Hydraulic differential pressure switch contacts stuck
15
Gas valve control error
18
Hydraulic circuit automatic filling in progress
19
Fault in system filling phase
20
NTC flow sensor faulty
28
NTC fumes sensor faulty
40
NTC return sensor faulty
50
NTC domestic hot water sensor faulty
53
Fumes outlet obstructed
55
Electronic board not calibrated
Communication problem between boiler board and control unit.
83...87
Probable short circuit on wiring.
92
Fumes fault during calibration (probable fumes recirculation)
109
Air in boiler circuit (temporary fault)
and a number (fault code). For a complete list of faults, see the
for 2 seconds. If faults are displayed frequently, call the Authorised Service Centre.
Service action
Check the sensor (*).
Check correct operation of the pressure switch and the wiring.
See the actions indicated in E12.
Check the connections between the gas valve and the
electronic board. If necessary, replace the electronic board.
Wait for the end of the filling cycle.
Check the filling tap.
Check the sensor (**).
Check the continuity of the probe wiring.
Make sure the wiring has not shorted.
Check the fumes NTC probe (***).
Check the continuity of the probe wiring.
Make sure the wiring has not shorted.
See the actions indicated in E20.
See the actions indicated in E20.
Check that the drainage pipe is free from obstructions.
Switch off the electric power supply to the boiler for a few
seconds.
Activate the automatic calibration function described in the
spare parts instructions sheet.
Check the wiring between the Ambient Unit and the electronic
board or RF link.
Check for any recirculation of fumes.
Activate the automatic calibration function described in
the paragraph YEARLY MAINTENANCE – REPLACING
COMPONENTS.
Check pump operation.
Check the pump power input wiring.
15
7812938 (03-01/23)
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