If ya go to the Search function and type fireplace or Dimplex you will come up with a Lot of posts on his subject and a few by me Basically you have to pull the fireplace out take the panels off and Vacuum and clean all the dust and cat/dog hair in there by the sensor and everywhere else and while you are in there tighten all the electrical wires in there too they get a little loose with all the bouncing around over the years,I do it once a year it is no big deal just time consuming with all the little screws holding the panels together
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