Table of Contents
Advertisement
Diagnosis
System char-
acteristics
The boiler will
not start
Burner control
unit enters a
fault state
Control unit faults:
Boiler control unit service instruc-
tions
Cause
No voltage
Boiler water tempera-
ture too high
The high limit safety
cut-out has responded
The flue gas monitor-
ing device (if installed)
has responded
Strapping plug CN2 is
missing at the burner
control unit
No gas available (air in
the gas line)
The pilot burner will not
start
Ionisation current too
low or cable break
Action
Check the MCB/fuse and power cable
connections.
Check the setting of the switch on the
control unit.
Wait until the boiler water temperature
has dropped by approx. 20 K.
Press the reset button on the control
unit.
Wait approx. 17 min;
if the boiler then starts automatically,
check the flue pipe and the chimney.
If the boiler does not start automatically,
check the flue gas monitoring device (see
page 23).
Retrofit strapping plug CN2 or a flue gas
monitoring sensor.
Press the reset button at the burner con-
trol unit.
Check the ignition electrode (see
page 20).
Check the gas supply.
Check the ionisation current (min. 3 µA
when main burner is lit) (see page 17).
Troubleshooting
25
Hide quick links:
Advertisement
Table of Contents
