GB-10
D
GB
F
NL
I
E
? Fault
! Cause
•
Remedy
Possible faults and suggested solutions
?
LED flashes.
OFF
AUTO
+AUTO
1
2
3
4
5
!
Pressure switch does not switch.
•
Check inlet pressure p
u
.
!
Gas pressure on the burner too low.
•
Readjust gas pressure p
G
on the combination
control, see page 6 (Adjusting the heater).
!
Fuse F2 defective.
•
Replace fuse (3.15 A, slow-acting, H). Ensure
that only one heater is directly wired to the ther-
mostat, see page 3 (Wiring).
?
LED flashes.
OFF
AUTO
+AUTO
1
2
3
4
5
!
Vane switch does not switch off during the “no
flow” state check on burner start-up.
•
Check that the vane switch is functional, see
?
LED flashes.
OFF
AUTO
+AUTO
1
2
3
4
5
!
The vane switch has not switched on 25 s after
the fan has been switched on.
•
Vane, fan or grille are dirty. Clean, see page 12
•
Fuse F1 defective (8 A, slow-acting, H). Check
the function of the fan and replace fuse F1 if
necessary.
!
Motor defective.
•
Remove the device and return it to the supplier.
?
LED 4 flashes.*
OFF
AUTO
+AUTO
1
2
3
4
5
!
On burner start-up, the BCU has not detected
a flame during the safety time. In the parameter
“Number of start-up attempts”, it is possible to
program up to three start-up attempts. If one of
the further start-up attempts is successful, fault
signalling stops automatically once the post-
purge time has elapsed.
•
Ignition is not working properly.
Clean the ignition electrode and check for correct
distance, see page 12 (Maintenance).
Check the connection of the ignition cables for
damage or moisture.
The spark plug must be fitted correctly.
Check the ignition spark optically and acoustically
from the fan side during the 4-second ignition
time.
•
Poor flame signal due to incorrect burner ad-
justment. Readjust gas pressure p
G
•
Poor flame signal due to dirty/badly connected
ionization electrode.
Clean the ionization electrode and check for cor-
rect distance, see page 12 (Maintenance).
Check the cable connection, cable and plug for
damage or moisture. The plug must be fitted
correctly.
Check the yellow and green burner ground cable
for corrosion and to ensure it is firmly connected.
•
Air in the gas pipe. Vent the gas pipe.
•
Valves do not open. Remove the valve plug on
the combination control CG and measure the
voltage between L1 and N during the safety time.
If the voltage is not adequate, first replace the
CG and return it to the supplier.
Attention!
Only commission the new BCU once
the short-circuit or fault on the valve output of
the CG has been remedied. Otherwise, the new
BCU will be damaged.
•
If the fault continues to be signalled, there may
be a short-circuit on the valve output. Return
the burner control unit to the manufacturer for
inspection.
•
Short-circuit on ignition output. Replace fine-wire
fuse F2: 3.15 A (slow-acting, H) and check the
safety function, see page 14 (Checking the safety
functions and burner operation).
