20
Troubleshooting
Diagnosis using light diodes on control panel
The location of the diodes on the control panel is shown on page 27.
Malfunction Possible cause Action
High pressure pump
operates but burner fails to
ignite
Ignition cable defective
Ignition transformer defective
Burner motor (M2) defective
Coupling between burner motor
and fuel pump defective
Fuel pump defective
Fuel magnetic valve (Y1) dirty or
defective
Press switch (S3) or (S5)
defective
Contactor (K3) defective
Check and replace if necessary
Check and replace if necessary
Check and replace if necessary
Check and replace if necessary
Check and replace if necessary
Clean, check, replace if
necessary
Check and replace if necessary
Check and replace if necessary
IMPORTANT!
The system must be
connected to the power
mains when the LEDs
are checked.
You must therefore be
as careful as possible.
Disconnect the system
from the power mains
as soon as possible
afterwards.
Remove the plug from
the socket!
Diode Illuminates when
Diode D7 must light up directly after the system is
switched on, otherwise check fuses F1 and F2 on the
circuit board.
D7 Motor start-up allowed
- heating element press switch (S5) in
rest position or re-run delay active
D11 Excess temperature not exceeded
- Klixon (S1) not actuated
D12 Magnetic valve release illuminates 3.5 seconds after D17
D16 Motor start-up allowed
- heating element press switch (S5) in rest position
D17 Burner start-up allowed
- Thermostat (B1), flow controller (S2)
and pump press switch have actuated
D18 Low oil level
- float switch oil control (S4) closed
D20 In case of sensor breakage refer to Flame Monitor
Sensor.
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