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12 Troubleshooting
For all the faults* mentioned above, and for any others that may occur, it is advisable to call in a qualified person, and to entrust
any necessary repairs to a specialised firm only.
* Please keep the designer of the unit informed of any faults
FAULT CAUSE REMEDY
Burner does not light Burner safety cut-off button or burner relays
disconnected.
Push safety cut-off button. If burner does
not work properly after several attempts, call
service engineer immediately
No ignition Short-circuited ignition electrodes Adjust
Ignition electrode gap too wide Adjust
Dirty or wet ignition electrodes Clean
Ignition cable charred Determine cause and remove, Change
ignition cable
Flame detector (photoresistor) soiled or
faulty
Clean if soiled,
replace if faulty
Blown insulator or ignition electrode Replace
Faulty ignition transformer Replace
Faulty automatic firing system Replace
Motor does not run Faulty condenser Replace
Oil pump dirty or seized Clean or replace
Seized bearing Replace motor
Faulty motor Replace motor
Pump does not deliver oil Damaged drive Replace
Suction valve leaking or seized Clean or replace
Suction tube leaking Retighten screw connector
Air in suction tube Bleed at pump
Filter dirty and clogged Clean
Filter leaking Replace
Incorrect burning Atomising pressure too low Increase pump pressure setting
Loud noises from pump
Pump is sucking in air, vacuum in suction
tube too high
Tighten screw connector. Check tube for
cuts.
Irregular atomising Jet nozzle partially blocked Replace jet
Nozzle worn out from over-use Replace
Filter soiled Clean
No oil-flow Jet hole blocked Replace jet
Oil flows out as soon as burner
starts up
Leaking magnetic oil pump valve (or
possibly dirty)
Clean or replace
Smell of gas Leaking tubes, armatures or burners Shut off gas taps at meter and at connection
to device. Contact customer service or gas
supply company immediately.
Smell of oil Leaking tubes, armatures or burners Check units for leaks. Repair leaking
sections or contact specialist repair firm.
Circulation pump does not run or
cuts off
Loose cable clamp or bridge Tighten all clamp screws
Faulty condenser Replace
CO
2
value too low Air intake incorrectly set Check combustion chamber settings
Leaking flue pipe Seal flue pipe
Flue gas temperature too high Dirty boiler Clean
Air intake incorrectly set See above
Chimney draught too strong
Flue gas temperature too low Burner capacity too low or burner too small Have draught interrupter installed
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