Fault rectification

Fault finding only by qualified electrician. Call on the services of a qualified electrician any time there is a fault. Repairs should only be carried out by a qualified electricians.

Switch off mains fuse, secure against being accidentally switched back on and position a warning sign.

Malfunction	Cause, measures
Both LEDs off.	No mains voltage. Check whether the mains fuse has failed. Switch on if necessary.
Both LEDs blink three times.	Internal combination sensor error. The internal combination sensor has not been detected. Check for firm seating and correct mounting orientation.
Both LEDs blink five times.	External combination sensor error. The connection to the external combination sensor is interrupted. Check the sensor connection cable and plug contact.
Fan does not switch on	Impeller blocked. Should only be carried out by a trained specialist: Remove cover. Unlock internal grille via locking hook (arrow) remove. Check impeller and clean if necessary.