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In this operating mode, the unit cannot be addressed via radio or local input, and temperature fluctuations in the room will likely occur. As soon as sufficient electrical energy is available, the actuator ends the forced heating and resumes normal operation. General reloading of the storage by means of forced heating requires full heating operation over several days, which is why this state should must be avoided in advance by taking suitable measures (monitoring the ES bit). Operation in unheated or insufficiently heated rooms is to be avoided.