18
System char-
acteristics
Cause
Action
The boiler will
not start
No voltage
■ Check the MCB/fuse and power cable
connections.
■ Check the setting of the switch on the
control unit.
Boiler water tempera-
ture too high
Wait until the boiler water temperature
has dropped by approx. 20 K.
The high limit safety
cut-out has responded
Press the reset button on the control
unit.
The flue gas monitor-
ing device (if installed)
has responded
Wait approx. 17 min:
■ If the boiler then starts automatically,
check the flue pipe and the chimney.
■ If the boiler does
not
start automatical-
ly, check the flue gas monitoring device
(see page 16).
Strapping plug CN2 is
missing at the burner
control unit
Retrofit strapping plug CN2 or a flue gas
monitoring sensor.
The gas pressure
switch has responded
and interrupted the gas
supply
Check the gas pressure.
Burner control
unit enters a
fault state
No gas available (air in
the supply line)
Reset by switching the control unit ON/
OFF switch ON and OFF.
The pilot burner will not
start
Check the ignition electrode (see
page 14).
Check the gas supply.
Ionisation current too
low or cable break
■ Check the ionisation current: Min.
3 µA when main burner is operational
(see page 12).
■ Remove the pilot burner and check for
damage (see page 14).
Control unit faults:
Boiler control unit service instruc-
tions
Troubleshooting
Diagnostic system
5692 699 GB
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