Product Manual

Description of function - Troubleshooting
The thermostat (4) is controlled via a thermo-sensor (18) mounted at the outlet of the
heaiting coil.
In the switchbox (below the operating panel), a fuse (F1) is installed on the board
protecting the motor (11) of the fuel pump and the ventilator. If the motor is overloaded
the fuse trips. This may happen if the fuse pump is blocked or sluggish - the same applies
if the ventilator is blocked or sluggish or in case of an electrical malfunction.
Another fuse (F2) on the board trips, if the ignition transformer (17) is faulty.
There is a thermosensor (21) in the waste gas tube, which controls an excess
temperature relay with trigger function (19), i.e. when the exhaust gas temperature
in the chimney increases above 230 °C, this relay triggers. To activate it again, you
must wait until the combustion unit has cooled down, i.e. approximately 15
minutes. Then, you can press the button under the cover (19) again. The excess
temperature relay can trigger when the machine is operated over a longer period in
the highest steam level, or when there is lots of soot on the heating coil due to poor
combustion, or when the inside of the heating coil is calcified, so that there is no
ventilation (cooling).
As further safety function, the burner is also switched off, when the water
temperature exceeds 150 °C.
The appliance is equipped with a visual flame monitoring device. A photo cell (16) is
installed above the burning chamber, switching off the fuel supply if the flame is
extinguished.
To avoid an overheating of the burning chamber a flow indicator (10) is installed in the
high pressure system between the high pressure pump (6) and the burning chamber
enabling a fuel supply only if water streams through the heating coil at the same time.
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Control board (p. 28-29)
The control board is equipped with two LEDs for trouble shooting.
L1: - permanently illuminated, if the overcurrent release has tripped.
- blinking, if the fuel flow valve detects only a low quantity of fuel in the tank or if
it is defctive.
L2: - illuminated, if the burner has been released but the flame is not burning. If the
flame starts burning within 2 seconds, the LED goes out.
If the LED does not go out the combustion has to be checked. If the LED is
not illuminated at all, the flame sensor has to be checked.
Nevertheless the cleaner can be used as a cold water high pressure cleaner
even if the burner is switched off.