GB-16
D
GB
F
NL
I
E
Assistance in the event of
malfunction
DANGER
Electric shocks can be fatal! Before working on
possible live components, ensure the unit is discon-
nected from the power supply.
Fault-clearance must only be undertaken by author-
ized trained personnel.
▷
Faults may be cleared only using the measures
described below.
▷
If the BCU does not respond even though all
faults have been remedied: remove the unit and
return it to the manufacturer for inspection.
?
Faults
!
Cause
•
Remedy
? The 7-segment display does not light up.
!
Mains voltage is not applied.
•
Check the wiring, apply mains voltage (see type
label).
0 1
A 1
? The display blinks and indicates
01
or
A 1
.
!
The BCU has detected an incorrect flame signal
without the burner having been ignited (extrane-
ous signal).
•
Direct the UV sensor exactly at the burner to be
monitored.
!
The UV tube in the UV sensor is defective (service
life ended) and issues a continuous flame signal.
•
Replace the UV tube, see UV sensor operating
instructions.
!
Flame signal through conductive ceramic insula-
tion.
•
Increase value of parameter 01 in order to adapt
the switch-off threshold of the flame amplifier for
burner 1.
0 2
A 2
? Start-up – no ignition spark – the display
blinks and indicates
02
or
A 2
.
!
The ignition cable is too long.
•
Shorten it to 1 m (max. 5 m).
!
Gap between spark electrode and burner head
is too great.
•
Adjust gap to max. 2 mm.
!
Ignition cable has no contact in the terminal boot.
•
Screw the cable on firmly.
!
Ignition cable has no contact in the ignition trans-
former.
•
Check the connection.
!
Ignition cable has short-circuited to ground.
•
Check installation, clean the spark electrode.
•
If the fault cannot be remedied by doing this,
remove the unit and return it to the manufacturer
for inspection.
? Start-up without flame – no gas supply – the
display blinks and indicates
02
or
A 2
.
!
A gas valve does not open.
•
Check the gas pressure.
•
Check voltage supply to the gas valve.
!
There is still air in the pipe, e.g. after installation
work has been carried out or if the system has
not been in operation for a long period.
•
“Purge” the pipeline and reset the BCU.
•
If the fault cannot be remedied by doing this,
remove the unit and return it to the manufacturer
for inspection.
0 3
A 6
0 6
A 2
0 7
A 3
A 7
? Start-up – flame burning – nevertheless, the
display blinks and indicates
2
or
3
on the
pilot burner/burner (burner 1) or
6
or
7
on the main burner (burner ).
!
Flame failure on start-up.
•
Read off the flame signal.
▷
If the flame signal is lower than the switch-off
threshold for the flame signal from burner 1 (pa-
rameter 01) or burner 2 (parameter 02), this may
be attributable to the following causes:
!
The set value for the cut-off sensitivity is too high.
!
Short-circuit on the flame rod as the result of
soot, dirt or moisture on the insulator.
!
Flame rod not correctly positioned at the flame
edge.
!
Terminal boot not properly connected to flame
rod.
!
Gas/air ratio incorrect.
!
Flame not contacting burner ground as the result
of excessively high gas or air pressure.
!
Burner or BCU not (adequately) grounded.
!
Short-circuit or discontinuity on the flame signal
cable.
!
Soiled UV sensor.
!
UV sensor wiring is defective.
•
Remedy fault.
0 2
