Operating instructions

Fault display structure
A Fault display
B Fault symbol
C Fault number
D Fault code
The red fault ind icator flashes fo r every fault.
A fault in the burner control unit causes the display to show "E".
Constant temperature control units
In case of faults, the fault code and
fault symbol will be displayed at the
programming unit
Weath er –compensated control units
The display flashes "Fault" if a fault
message is issued
Plain text fault displays:
&
Burner control unit
&
Outside temperatu re sensor
&
Flow sensor
&
Boiler sensor
&
Mixed flow sensor
&
DHW cylinder sensor
&
Flue gas sensor
&
DHW outlet sensor
Fault display
69
Troubleshooting
5692 619 GB