Open the cover of your unit and check that the driving belt is intact

An overheating alarm can occur when going from normal operation to "away mode" as the sudden lower flow may not be able to transport away the heat generated by the heater at that time. Check that your filters are not clogged and cause a lower flow over the electric heater.

To identify the source of the sound, you can restart the unit with the door open. There are three motors in the unit that start in specific order. First the Rotor engine starts then the Exhaust air engine starts and about 6 minutes later the Supply air engine starts (total start-up time Approx. 15 min)

This function helps you to lower the inside temperature of your house/building and is often used during the summer. As the temperature outside drops during the night and the inside temperature is higher than the outside this function can be activated. The unit will then shift to fan mode "Max" or the pre-set "Boost" mode [...]