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The control board
The control board is equipped with two LEDs for trouble shooting.
LED D3:
1. permanently illuminated:
if the overcurrent release has tripped.
2. blinking:
if the fuel flow valve detects only a low quantity of fuel in the tank or
if it is defctive.
LED D4:
1. 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 o.
D3
D4
Problem Cause
Heating (burner)
Set water temperature is reached. Increase
temperature on thermostat with rotary
control switch. Open trigger gun with safety
catch, until temperature drops. Fuel tank is
empty. Fuel filter is dirty/fuel nozzle is dirty.
Coupling between burner motor and fuel
pump is defect. Fan/fuel pump motor is
defect. Check electrical equipment. Check
fuse in electric box. Water in fuel tank. Dirt
or rust in the fuel pump. Clean tank. Replace
fuel pump.
Fuel is dirty. Nozzle or nozzle stock leaks.
Water in tank.
Check pressure switch (black). Solenoid val-
ve is defect or dirty. Clean filter, connections
and fuel pump. Setting is wrong. Clean or
replace fuel nozzle.
Check ignition cable. Charring of plug-in
contacts by moisture. Cable is broken. Check
ignition transformer connections.
Transformer is defect Ignition electrode has
been falsely set or burnt up.
Fan-/fuel pump motor is defect. Check
electrical equipment. Check fuse in termi-
nal box. Coupling between burner motor
and fuel pump is defect.
Fuel pump/fan operates, but
burner does not heat
Fuel pump/fan does not operate.
Fuel pump makes loud noises
Smoke during operation or after
switching o
Solenoid valve on the fuel pump
does not open
Ignition does not function
Ventilator does not operate.
Small repairs - do it yourself
Small repairs - do it yourself
22


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