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dal manuale si desume quanto segue: F 017 Overheating The hardware threshold value for the overheating sensor has been exceeded, because the control box failed to recognise the fault code 012 or 013 –> the control box is locked. If the heater is switched on again, the fault code 015 is displayed F 012 Overheating at the overheating sensor Overheating sensor has detected an excessive temperature. •Check hot air lines for clogging --> eliminate blockage •Sum of partial guide numbers of air conveying parts too large --> check air line, re-route if necessary. For partial guide numbers see accessory parts catalogue. •Check overheating sensor, diagram and values table see page 28, if OK, --> measure fuel quantity, see page 32. F013 Overheating at the flame sensor Flame sensor reports an excessive temperature at heat exchanger. •Check hot air lines for clogging --> eliminate blockage •Sum of partial guide numbers of air conveying parts too large --> check air line, re-route if necessary. For partial guide numbers see accessory parts catalogue. •Check flame sensor, if OK, --> check overheating sensor. If overheating sensor defect, --> replace combi-sensor. If overheating sensor OK, --> measure fuel quantity, see page 32. Diagram and values table for flame sensor and overheating sensor see page 28. Ciao gigi