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Rectifying problems
8 Rectifying problems
Malfunctions in fuel transport
The drives for transport of the fuel are monitored
by the control system. If the discharge screw or
the stoker screw is blocked, the control system tries to
unblock the screw by reversing it.
If the blockage persists after 3 attempts to remove it,
an error message is displayed. The boiler starts an
ember burnout and then switches to [Malfunction]
mode. As long as the blockage persists, the boiler can
no longer be switched on.
In the case of an error message with "current
draw too high", a single large piece of wood or a
foreign body is often blocking the discharge screw.
An error message with "overload" or "motor protection"
indicates wood chips that are too fine or too long are
interfering with the discharge screw. That overloads
the drive, which is switched off by the drive protection.
Before eliminating the blockage, switch off the boiler
with the mains switch. The maintenance covers can be
opened when eliminating the blockage.
Fig. 8-1: Access for eliminating blockage
1 Drop chute maintenance cover
2 Rotary valve maintenance cover
3 Safety switch for rotary valve maintenance cover
4 Drop chute safety switch
After removing the blockage, replace the covers and
switch the boiler back on with the mains switch.
Ash screw jammed
If the ash screw is stuck, a corresponding warning will
be displayed on the screen.
The most common cause of a blockage is a full
ash box. So first check to see how full the ash box
is and empty it. If the ash box is not full, then it can be
assumed that a foreign object is blocking the tilting
grate. In either case, perform the following steps.
1. End the boiler's heating mode with the On/Off
switch in the boiler overview window. As
soon as the [Switched off] operating condition is
displayed, switch off the boiler with the mains
switch.
2. Detach the ash box from the boiler and check the
visible part of the ash screw. The foreign body may
already be found at the end of the ash screw,
where it can be removed.
Fig. 8-2: Ash screw
3. If no foreign body is visible, it is probably in the
combustion chamber under the tilting grate.
Open the combustion chamber door and use the
poker to lift the combustion chamber cover and
lean it against the combustion chamber wall.
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