50
DIAGNOSING AND REPAIRING OPERATING FAILURES
FAULT DESCRIPTION
POSSIBLE CAUSE
REPAIR MEASURE
The heater will
not start
The device does not receive
electricity.
The power cord is not
connected to the socket.
Plug in the power cord.
The power grid does not
supply current.
Check the operation of the power grid and the
on-site fuses.
Burnt fuse
Replace the fuse (250V 3A).
The power cord is
disconnected from the
device.
Contact an authorised maintenance service.
The fuel warning light is on.
The fuel tank is empty.
Add diesel or fuel oil.
The current temperature is
higher than the set target
temperature.
Set the target temperature higher than the current
temperature.
The fuel pump makes a loud
noise.
There is air in the fuel
system.
Bleed the fuel system as described in the user
manual.
The burner is not receiving
fuel.
The fuel filter is dirty.
Replace the fuel filter.
The fuel pump’s bleed
screw is loose.
Tighten the wing nut intended for bleeding.
The burner is not receiving
sufficient voltage.
The mains voltage is too
low.
Connect the device to a 220/230V mains
network.
ERR error message
There is air in the fuel
pump.
Bleed the fuel system as described in the user
manual.
The fuel filter is clogged.
Check the condition of the fuel filter and replace it
if it is not fully yellow in colour.
The fuel filter and nozzle
are clogged.
If the fuel filter has been replaced and the device
still cannot be activated, the nozzle, too, is most
likely clogged and must be replaced.
ER 1 error message
Flame sensor issue
The flame sensor detects light before the burner
is activated. Ensure that the flame sensor is
positioned properly. The sensor may also be
damaged.
ER 2 error message
Temperature sensor error
The temperature sensor is probably damaged.
The heater can still be used in timer operation
mode. Please contact the official Airrex service to
fix temperature sensor.
ER 3 error message
Shock or tilt error
The warning light is lit if the device is tilted by
more than 30°C or subjected to a strong shock or
jolt. The heater is deactivated by its safety
systems.
ER 4 error message
Overheat error
The warning light is lit when the temperature in
the top section of the heating element exceeds
105°C. The heater is deactivated by its safety
systems. Once the device has cooled down, it is
automatically restarted. Place the device on an
even and solid foundation.
ER 9 error message
Preheating error
This error appears when preheating sensor or
preheater may be damaged.
The heater is
shut down soon
after activation.
The fuel warning light is on. The fuel is about to run out.
Add diesel or fuel oil.
The exhaust pipe emits a
puff of smoke when the
device is switched off.
The fuel filter is clogged.
Replace the fuel filter.
The fuel filter and nozzle
are clogged.
If the fuel filter has been replaced and the device
still cannot be activated, the nozzle, too, is most
likely clogged and must be replaced.
Incorrect fuel type
Drain the fuel tank and fill it with high-grade
diesel or fuel oil
The fuel contains water or
other impurities.
Drain the fuel tank and fill it with high-grade
diesel or fuel oil
The fuel pump is damaged.
Contact an authorised maintenance service.
