Operation Manual

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BMV3 / BMV4 / BMV5 : 662Y1000 • A
7. TROUBLESHOOTING
Diagnostic Cause Remedy
1 . Oil firing unit
Error signal lamp is not on
No voltage present
Boiler temperature controller incorrectly adjusted
Check wiring
Adjust
Error signal lamp on
Oil firing unit switched to malfunction
Oil firing unit defective
Incorrect wiring of terminal socket
Correct malfunction
Replace
Check wiring
Check oil pre-heater
2 . Motor
Motor does not start
Defective release thermostat of oil pre-heater
Defective capacitor
Stiff bearing
Stiff oil pump
Replace oil pre-heater
Replace capacitor
Replace motor
Replace oil pump
Loud noise caused by running motor
Motor defective
Bearing defective
Oil pump defective
Replace motor
Replace motor
Replace oil pump
3 . Ignition
No generation of ignition sparks
Ignition unit defective
Ignition cable defective
Oil firing unit defective
Insulator defective
Replace ignition unit
Replace ignition cable
Replace oil firing unit
Replace ignition electrodes
Weak ignition spark
Incorrect position of the ignition electrodes
Ignition electrodes severely contaminated
Position ignition electrodes
Clean ignition electrodes
4 . Oil pump
Inconsistent oil pressure, loud noise
from operating oil pump, no oil
pressure is built up
Intake pipe leaking (air entry)
Oil supply not according to the specifications
Intake pipe containing air
Oil stop valve closed
Coupling defective
Oil pump filter dirty
Oil pump drive defective
Paraffin sedimentation (+4 °C)
Fuel oil viscous (-1 °C)
Check oil supply
Check oil supply
Purge intake pipe
Open stop valve
Replace coupling
Clean/replace oil pump filter
Replace oil pump
Install at a frost-free place
Install at a frost-free place
5 . Magnetic valve
Magnetic valve does not open
Coil of the magnetic valve defective
Oil firing unit defective
Replace coil of the magnetic valve
Replace oil firing unit
6 . Flame monitoring
Fault shut-down without flame
generation
Extraneous light (photocell current >5,5 μA)
Photo conductive cell defective
Remove extraneous light
Replace photocell
Fault shut-down with flame generation
Photo conductive cell contaminated
Photocell current too weak (photocell current < 55 μA)
Clean photocell
Reset burner
7 . Nozzle
Inconsistent atomisation, high CO
and soot emissions
Defective nozzle
Oil pressure not in compliance with specification
Diaphragm valve defective
Replace nozzle
Adjust oil pressure
Replace oil pre-heater
8 . Baffle plate
Baffle plate / burner pipe very
contaminated
Incorrect burner adjustment
Inconsistent atomisation of the nozzle
Adjust burner
Replace nozzle
Replace oil pre-heater
Nozzle is dripping Replace oil pre-heater
Incorrect nozzle type (spraying angle, spraying
characteristics, installation size)
Insert nozzle according to specification
9 . Fan
Fan delivers not enough air
Fan wheel contaminated
Fan wheel damaged
Clean fan wheel
Replace fan wheel
Loud noise during fan operation
Fan wheel incorrectly positioned
Fan wheel damaged
Air flap incorrectly installed
Correctly position fan wheel
Replace fan wheel
Correctly install air flap