
9
All the faults are displayed in order of importance; if several faults occur simultaneously, the first to
be displayed is the one with highest priority. After the cause of the first fault has been removed, the
second one will be displayed, and so on.
If any given fault occurs frequently, contact the authorised Service Centre.
Fault description
outdoor temperature probe sensor
failure
ntc output sensor failure
domestic hot water ntc sensor failure
safety or flue gas thermostat tripped
Loss of flame during operation (the
ionization current has fallen below
the limit)
Minimum fan speed limit is hurt
floor thermostat tripped
no gas
boiler circuit board error
the reset key has been pressed
inappropriately
internal error on boiler circuit module
fan speed threshold not reached
no hydraulic pressure switch enabling
signal
3.9 Fault warnings table
Fault
code
E10
E20
E50
E110
E128
E129
E132
E133
E151
E153
E154
E160
E164
action required
call the authorised service centre.
call the authorised service centre
call the authorised service centre
press the reset key (for about 2 seconds: if this device is triggered
repeatedly, call the authorised service centre)
Call an authorised service centre.
Call an authorised service centre.
call the authorised service centre
press the reset key (for about 2 seconds); if the fault persists, call the
authorised service centre)
Press the reset button if the display presents the ( ) symbol, otherwise
switch off the boiler at the mains and switch it on again after 10 seconds.
If the fault persists, call an authorised service centre. Check the position
of the ignition electrodes (chapter 19).
press the key again (about 2 seconds)
Press and hold reset button (2 seconds approx.) then press again when
warning E153 appears
call the authorised service centre.
check that the system is at the rated pressure. (refer to the section on filling
the system). if the fault persists, call the authorised service centre.