User manual P 40 - P 120
Issue: 11.14
9 Dealing with faults
Page 21
List of possible malfunctions
LED
Malfunction
Cause (▄) / Solution (►)
4
BCU did not recognise a flame
during the safety time.
There will be no automatic start
attempt
▄ No (adequate) ignition
►Check distance electrodes; check connection ignition
cable; clean ignition electrode; check ignition
▄ Bad flame signal caused by wrong setting burner
►Adjust burner (pressure) properly
▄ Not enough light current caused by dirty or badly
connected photocell (-pipe)
►clean photocell (-pipe); also check the cable
▄ Air is the oil supply -> Bleed oil pump/conduits
▄ Short circuit at ignition- or oil valve connection BCU
► Check wiring.
Advise:
When a short circuit is found at the oil valve exit, the BCU should be sent back to the
manufacturer, or:
1. Replace fuse F2: 3,15 A (slow, H) and check security function
2. Close manual oil valve.
3. Start the appliance for a few times and check security function
4. When a malfunction is detected, send the BCU to the manufacturer.
WARNING!
When this security function is not checked, the oil valves may stay open and unburned
oil might flow into the room
–
Danger of explosion!
5
Max. temperature of overheat cut off device (STB)
exceeded. (manual reset needed)
▄ Ventilator does not cool down
▄ Dirt ► Clean
4+5*
Max. temperature of overheat guard device (STW)
exceeded. (automatic reset)
► Set a longer cooling down period
▄ Dirt ► Clean
2+5
Premature flame signal (before a flame is
possible)
► Faulty flame signal.
1+5
Incorrect function of overheat cut off/guard device
► check connections
▄ Temperature sensor is below –20°C
3+4*
Time between two starts is too short. (automatic reset after waiting time)
2+4
Flame dropped during operation
(Heaters with 3 start attempts will make
a new start when the heater has burnt for
at least 2 seconds)
▄ Bad flame signal caused by wrong setting burner
► Adjust burner (pressure) properly
▄ Bad flame signal caused by dirty or badly connected
photocell.
►Clean photocell (-pipe); also check cable
1+4
Remote reset (connection 31/32) is switched
longer than 10 seconds. (Permanent reset)
► Only push reset when appliance has a
malfunction
1+3
Flame signal did not dissipate within 5 seconds
after the oil valves closed -> Oil valves do not
close properly.
► close oil supply
► check correct functioning burner / oil valves
1+2
Internal tension error
3+4+5
During a malfunction more than 5 times in 15 minutes the remote reset (connection 31/32) is
switched. (automatic reset after waiting time)
Errors indicated with a
*
will reset automatically after the problem has dissolved, sometimes after a small
pause. Pushing the reset-button in this case has no use.
