E12
Dimplex Supply Voltage Out of Range

E12 error; unit intermittently shuts down under high demand

Advertisements

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Advertisements

Possible Causes

Low mains voltage under load, Overvoltage condition, Loose supply terminals, Undersized wiring causing voltage drop

How to Fix / Troubleshooting

Danger: Work on mains supply only if you are qualified. Otherwise, call an electrician.

  • Check supply connections: With power off, inspect the incoming supply terminals in the Dimplex heater for tightness and signs of overheating. Tighten to specified torque.
  • Measure voltage: With a multimeter and appropriate safety precautions, measure voltage at the unit while it is operating. Compare to the rating plate (e.g., 230–240 V). Significant deviation may trigger E12.
  • Inspect wiring size: Ensure the cable size meets Dimplex installation requirements for the heater's kW rating and run length.

Action: If supply issues are found, have a licensed electrician correct them. If supply is stable but E12 persists, the control PCB voltage sensing circuit may be faulty.

Advertisements

Repair Difficulty

Professional Required 5/5

Required Part

Incoming Supply Wiring / Main Control PCB
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements