How to Replace the LED Driver in a Dimplex Optiflame CHT20LE Electric Fire

These instructions are to repair a fault on a Dimplex Cheriton CHT20LE fire, where the LED flame effect comes on initially, but goes off after a few minutes. After switching the fire off and on again, the flame effect works again for a few minutes and then goes off. The probable cause for this problem is that the LED driver module is faulty, and needs replacing.


  1. 1
    Unplug the fire from the mains.
  2. 2
    Remove the coals or pebbles from the front grate.
  3. 3
    Using a cross-head screwdriver, remove the 2 screws at the front of the grate. Then remove the grate.
  4. 4
    Remove the rotisserie. Gently pull away the rubber connector from the motor, and then slide it out to the right.
  5. 5
    Look for the 2 LEDs mounted on a metal bracket. The bracket is held by 4 screws accessible from the back of the fire. Remove these screws using a cross-head screwdriver, and gently pull the bracket out. Gently remove the LED module from the bracket.
  6. 6
    Using a cross-head screwdriver, remove the covers at each end of the module, revealing the electrical connections. Before disconnecting the wires, make a note of which colour of wire goes to which connector. The low voltage connectors are marked with a "+" and "-". This is very important, as the LEDs could be damaged if connected the wrong way round. Now disconnect the wires.
  7. Image titled RACD12 350.JPG
    Get your replacement module. If possible, buy a replacement module, type SLT12-350IF, but a retailer for these may be difficult to find. Otherwise, a suitable replacement is RACD12-350, made by Recom. This can be bought from RS Components, part number 7377067, and has the same electrical and physical specifications.
    • Image titled SLT12 350IF
  8. 8
    Reconnect all the wires, taking care with the polarity.
  9. 9
    Re-fit the bracket to the rear wall of the fire, using the 4 screws.
  10. 10
    Re-fit the rotisserie.
  11. 11
    Re-fit the grate using the 2 screws. Replace the coals or pebbles.


  • The fire must be unplugged from the mains before starting this work.

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Categories: Electrical Maintenance