11
Troubleshooting
The unit does not start
Check the power supply.
Check the operating and/or main switch.
Check that the burner is functioning properly.
Check the safety temperature limiter.
Keep in mind: before resetting the STB, it is abso-
lutely necessary to determine the reason it was acti-
vated and take appropriate measures
The following are possible causes:
-
The unit could not cool down because the power
supply was interrupted. Even short interruptions
can activate the STB.
-
The temperature of the air being blown out is too
high because the grilles have not been properly
adjusted.
-
Air intakes and outlets are blocked.
-
The fan was overloaded (the thermal contacts in
the fan motor were activated).
Check the room thermostat setting.
The room thermostat must be set higher than the
room temperature.
Set the operating switch to “II”.
If the air supply fan starts now, look for the problem
in the burner.
The burner does not start
Check that the operating switch is set to “Heizen”.
The green control light must be lit up.
Check the room thermostat setting.
The room thermostat must be set higher than the
room temperature.
Check that all shut-off fittings in the oil supply are
open.
Check whether the fuel filter is dirty.
Check that there is enough fuel in the fuel container.
Check whether paraffin has accumulated in the
heating oil.
This can occur even at 5 °C.
Check oil lines for damage.
Leaks can cause air intake.
Use suitable means to ensure that the safety tem-
perature limiter (STB) and the temperature monitor
(TW) are functioning properly.
Check the sensors and capillary pipes of the safety
temperature limiter (STB) and the temperature moni-
tor (TW) for damage and ensure that the sensor has
been properly positioned.
Check whether the red control light (burner malfunc-
tion) on the operating panel is lit up.
Important information about resetting the burner
If, during the start phase, the unit is switched off
again due to a malfunction, it may only be restarted
after 5 minutes have elapsed.
Take any steps necessary to prevent another reset.
Danger of deflagration.
The problem must be fixed by authorised service
personnel!
The air supply fan does not start
Set the operating switch to “II”.
The air supply fan should now start.
Check the fan for smooth operation and any dirt.
Check the electric cord on the fan motor for damage.
Check whether the capacity of the fan was ex-
ceeded.
The thermal contacts in the fan motor have been ac-
tivated.
Check the operating capacitor of the fan.
Use suitable means to ensure that the fan control
thermostat (TR) are functioning properly.
For safety purposes, repair work on the electrical
components and the burner may only be per-
formed by authorised personnel.
After working on the unit, conduct an electrical
safety test.
Should the unit still not function properly after per-
forming these checks, please contact an author-
ised service centre.
Resetting the automatic burner relay
If the red control light (burner malfunction) is lit up, re-
lease the relay by pressing the malfunction button on
the automatic burner relay.
The malfunction light goes out and the burner tries to
start.
The red control light of the automatic burner relay also
blinks in a code which helps service personnel identify
the cause of the malfunction.
Remember that the oil-preheater causes a delayed
burner start.
