While you wait for answers, we may have found some information which could help you.
Click here for Replace Dimplex FireDimplex Optiflame X1S Series B stopped working?
Dimplex duo heater?
cannot turn off dimplex electric fire?
Light not working?
Looking for reset button on dimplex convector heater DX25F10?
Faulty lights on Dimplex mk11?