HearthStone Nestor Martin S31 Owner's Manual page 19

3. Remove and clean the filter (Diagram 4-6), and refit it.
Remove the filter screws and clean the filter in fresh fuel oil, benzine, petrol, kerosene or hot water.
4. Remove the draining screw and rinse the oil control through with fuel oil from the tank until clear oil emerges
at the point of drainage. In the case of models with no draining screw, the fuel oil must be removed from the
interior of the oil control by means of a suction pump. Note: use only a soft pipe inside the oil control to
prevent damage to any of the interior components.
5. If water should be found inside the oil control, it is advisable to remove the pipe between the oil control and
the burner and to clean it. After the above-mentioned operations have been carried out, a trial run lasting at
least 15 minutes must be made with the device set first at low and then at high (control knob position 1) and
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