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Troubleshooting
E 12 Fan speed out of the limits
If the fan actual-speed is out of a range of the fan set-speed for more than 15 seconds, a locking is occured.
A maximum variation is 20 % of the set value.
E 13 Parameter programming
After loading of a parameter from the laptop to the automatic firing unit the boiler will be locked automatically.
After reseting the boiler can be used again.
E 14 Failure while loading parameters
A connection failure while loading of the parameters with SITlab is occured. The progress needs to be re-
peated.
E 15 Internal fault in the automatic firing unit
E 16 Internal fault in the automatic firing unit
E 17 (Flow – Return) > 45K für 10 Sek
If the difference between the flow temperature and return temperature is higher than 45K for more than 10
seconds during a heating demand, a locking is occurred.
E 18 Safety boundry thermostat (STB is not used!)
If the safety boundary thermostat is activated, a blocking is demanded immediately. After 5 seconds this will
change into a locking.
E 19 Air pressure switch function defective (Air pressure switch is not used!)
Control occurs before starting the burner while the pre-ventilation phase (switch is closed) and while the fan
is standing still (switch is open). If there is a failure a „5“ (air pressure switch is defective) appears on the
display. The period of this condition should only last maximum 5 minutes, afterwards a locking occurs.
