Krom Schroder BCU 46 Series Operating Instructions Manual page 17

E 0 2
? Start-up – no ignition spark – the display
blinks and indicates
!
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
!
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.
E 0 2 E 0 3
E A 3
E A 2
?
Start-up – flame burning – nevertheless, the
display blinks and indicates
the pilot burner/burner (burner 1) or
on the main burner (burner ).
E 07
! 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 A001) or burner 2 (parameter A002), 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.
E A 2
or .
E 02 E A2
E 02 or E A2 .
E 0 6 E 0 7
E A 6 E A 7
E 02 or E 03 on
E 06 or
! 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.
E
? The display blinks and indicates
!
The BCU has detected an incorrect flame sig-
nal without burner 2 (main burner) having been
ignited (extraneous signal).
• Direct the UV sensor exactly at burner 2 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 A002 in order to
adapt the switch-off threshold of the flame ampli-
fier for burner 2.
E 0 8
? Operation – flame burning – burner  inter-
rupted – the display blinks and indicates
E 08 or E A8 .
! Flame failure during operation or during delayed
controller enable.
• Read off the flame signal, see page 25 (Read-
ing off the flame signal, fault messages and pa-
rameters).
▷ If the flame signal is lower than the switch-off
threshold for the flame signal from burner 2 (pa-
rameter A002), 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.
!
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.
GB-17
E A 5
0 5
E 05
E A 8
or E A5 .