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Flex Fuel Owner’s Manual
March 2011
Burn back damper blocked!
The burn back damper could not be fully opened during pellets start.
Possible causes of this error message:
• Functional fault of the burn back damper (mechanical or electrical)
• Blockage near the burn back damper
If it was possible to clear the cause of the fault, press the Control Knob, otherwise switch off the furnace
using the ESC button and notify your WoodMaster Flex fuel Dealer.
Ignition not possible!
The ignition procedure in pellets operation could not be completed in the specified time! The
furnace will shut itself down after the fan lag time has elapsed. The error message “IGNITION
NOT POSSIBLE” will be shown on the display.
Causes of this error message:
• No pellets in hopper
• Incorrect or slag-covered insert in firebox
• Furnace not adequately cleaned (ash, heat exchanger)
• Mechanical or electrical causes (conveyor motors, igniter)
If it was possible to clear the cause of the fault, press the Control Knob, otherwise switch off the furnace
using the STOP button and notify your WoodMaster Flex fuel Dealer.
Break of feed sensor!
The selected furnace operating mode is set to “Pellets-automatic” and the feed sensor has been
retracted or has a break. The furnace operating mode is automatically reset to “Bulk materials”.
Check whether the feed sensor is correctly connected to the I/O Board (section 5.6)
of the Flex fuel. If you have checked that the cabling is correct, please contact your WoodMaster Flex fuel
Dealer.
Flue gas temperature too low!
In automatic mode (pellets) the flue gas temperature has not exceeded a necessary threshold or has
fallen below the threshold for a factory set amount of time. The furnace then turns off after a fan lag.
At the end of this lag, this error message appears on the display:
The most probable cause of this error message is a faulty air supply.
Wait until the furnace has cooled down and clean the firebox (primary air deflectors,
insert), ash chamber and flue pipe.
To restart the furnace, please press the control knob.
16: Error Messages