While you wait for answers, we may have found some information which could help you.
Click here for Model Unit StartedLight not working?
Dimplex Cavendish Optimyst electric fire?
How to change LED driver on Dimplex fire?
Looking for reset button on dimplex convector heater DX25F10?
Help on how to fix my dimplex clb20r?
Faulty lights on Dimplex mk11?