16
DIAGNOSING AND REPAIRING OPERATING FAILURES
FAULT DESCRIPTION POSSIBLE CAUSE REPAIR MEASURE
DEVICE WILL NOT
START
The device does not
receive power, none of
the signal lights are on.
The plug is not connected to the
socket.
Connect the power cord plug
to the socket.
The power grid does not supply
current.
Check the operation of the
power grid and the on-site
fuses.
Burnt fuse Replace the fuse.
The “Power” signal
light is on but the
heater is not running.
The water temperature is higher
than the set target temperature.
Increase the target
temperature or wait for the
water to cool down.
The “MISFIRE”
warning light is on.
Fuel has run out.
Refuel the heater and bleed
the fuel supply system.
The fuel has hardened.
Warm up the fuel. Add fuel
that is more resistant to low
temperatures.
There is air in the fuel pump.
Bleed the fuel supply system
(see instructions on page10.)
The “OVERHEAT”
warning light is on.
The overheat prevention
function has been activated.
Allow the water to cool.
Clean any water circuit
blockages and reset the
overheat sensor (instructions
on page14.)
The temperature sensor has
failed.The circulation pump has
failed.
Contact the maintenance
service to repair the sensor or
pump.
The burner has failed.
Contact the maintenance
service to repair the burner.
NOISY BURNER
Instructions on page15.
The fuel pump is noisy
during operation.
There is air in the fuel system.
Bleed the fuel supply system.
Instructions on page10.
The burner has failed.
Contact an authorised
maintenance service.
If the heater is not functioning, check the following:
Is the power connected?
Is there sufficient fuel?
Is the flame detector clean?
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