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March 2011
Flex Fuel Owner’s Manual
13: Pellets Auto Control
Feeder temperature too high! Fan lag!
The temperature monitor in the feeder has measured an over temperature. Fan lag is activated and the
feeder is emptied. The fan lag cycle (duration 10 – 30 minutes) is completed even if the feeder
temperature drops again.
The furnace starts automatically if the feeder temperature has dropped when the fan lag cycle has
completed. If the feeder temperature remains too high, fan lag is activated and the feeder is emptied.
Air factor too high! Fan lag!
The status line “Air factor too high! Fan lag!” occurs if the air factor remains above 5.00 for approximately
1 minute in “Pellets mode” or during the start phase.
Possible reasons as to why the air factor increases in “Pellets mode” or during the start phase:
• You have opened the firebox door or the ash door either in the start phase, or in “Pellets mode” without
deactivating the “Flue gas and air factor monitoring”.
• The pellet reservoir is empty. Check that sufficient fuel is available.
• The feed runs slowly and is blocked.
• The insert is worn or the fuel has a very high dust fraction so that a lot unburned material falls through
the insert.
• The insert is clogged with ash, foreign bodies, etc, and should be cleaned. Switch the furnace off, wait
until the operating status “Boiler off” is displayed and the furnace to cool, then clean the insert.
The furnace completes “Pellets mode!” by initiating “Fan lag!”. Fan lag ends when the flue gas
temperature falls below the factory default switch-off threshold and the run-on time has elapsed. The
furnace then switches to standby mode (“Availability!”) and automatically restarts when a heating circuit
demand is present.
Ignition time elapsed! Fan lag!
The furnace could not be ignited in the required time (factory default setting 50 minutes). The furnace
completes pellets mode by initiating fan lag. Fan lag ends when the flue gas temperature falls below the
factory default switch-off threshold and the run-on time has elapsed.
A fault message is then shown on the display. Check possible causes of the ignition fault before
acknowledging the message and restarting the furnace.
IGNITION NOT POSSIBLE!
Press START to start up the
boiler and STOP to Switch off
the boiler!
Boiler temperature: XXºF
Flue gas temperature: XXºF
Air factor X.XX
