Like any receiver the clock needs a good signal to work properly. The main causes of reception failure might be atmospheric and local interferences, interference from electric equipment e.g. TV, computer or radios, reduced local signal due to steel framed structure, location of the clock internal receiver within the building etc. The following suggestion may help improve reception of the MSF signal: Checking that the battery/ies are new and in good condition. Checking that the battery/ies are inserted correctly. Try rotating the clock as the internal receiver that picks up the signal is most effective when it is facing directly towards or away from Anthorn. Trying to move the clock to a new location away from any electrical equipment e.g.