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30
Troubleshooting
Hot water mode
The fuel manometer shows the fuel pressure.
If no pressure is shown, check if
- there is heating oil in the tank.
- the fuse in the electric box (below the operating panel) for the motor has blown.
- the fuel sieve or the fuel sieve in the pump is dirty.
- the fuel pump does no operate smoothly or is blocked.
- the ventilator jams.
The thermostat grants permission to open the solenoid valve. The burner starts and
heats the water to the temperature preset by you. As soon as the temperature is rea-
ched the burner switches off.
If the temperature drops again, the burner switches on automatically, so that the desired
temperature is constantly kept.
The thermostat is controlled by a thermosensor, mounted to the outlet of the heating coil.
In the electro distributor box (below the operating panel), there is a fuse (circuit diagram
F1) on the PCB which protects the motor for fuel pump and ventilator. If the motor is
overloaded, the fuse blows. This can happen when the fuel pump is blocked or does not
work freely, when the ventilator is blocked or does not operate freely or when there is an
electrical problem.
A second fuse (circuit diagram F2) on the PCB triggers, if the ignition transformer is faul-
ty.
The transformer on the PCB is protected by two fuses (32 mA, 630 mA).
To avoid an overheating of the combustion chamber, a flow monitoring device is installed
between high-pressure pump and combustion chamber, which only permits fuel injection
if water is running through the heating coil at the same time.
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