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Troubleshooting
Malfunction
Heating (burner)
Fuel pump/blower operates, but
burner does not heat.
Fuel pump/blower does not operate.
- Pump makes loud noises. Fuel opera-
ting press. is not reached
Smoke during operation.
Smoke after switching off.
Solenoid valve on the fuel pump
does not open
Test: Pressure switch (black)
Bridge in terminal box between
terminal 3 +4
Test: Connect solenoid valve 230 V
externally.
Oil pressure on the fuel pump is
too low/too high.
Ignition does not function.
Ventilator does not operate.
Leakage
Gun drips. High pressure hose drips.
Manometer shows pressure
but no water comes out.
Sucking detergent
Detergent is not sucked.
Cause of malfunction / remedy
Set water temperature is reached. Increase
temperature on thermostat with rotary control
switch. Open gun, until temperature drops. Fuel
tank is empty. Fuel filter is dirty. Fuel nozzle is dirty.
Coupling between burner motor and fuel pump is
defective. Blower/fuel pump motor is defective. 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 valve is
defective or dirty. Clean filter, clean supply line, clean
fuel pump. Setting is wrong. Clean fuel nozzle, or
replace it.
Check ignition cable. Charring of plug-in contacts
by moisture. Cable is broken. Check ignition
transformer connections. Transformer is defective
Ignition electrode has been falsely set or burnt up.
Blower-/fuel pump motor is defective. Check electrical
equipment. Check fuse in terminal box.
Coupling between burner motor and fuel pump is
defective.
Replace seals.
Replace O-ring under screwed connection.
Clean nozzle.
Pump sucks air. Check hose clips.
Test: Connect water line to the pump.
Water inlet: 2 - 4 bar pre-pressure. No water must
come from the detergent hose.
31


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