E07
Dimplex Triac / Power Control Fault

E07 displayed; unit attempts to start then shuts down with no hot water

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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.

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Possible Causes

Shorted triac on control PCB, Open triac gate drive, Internal PCB track damage, Overcurrent event damaging power electronics

How to Fix / Troubleshooting

Warning: This is a high-voltage, high-current fault. Do not attempt board-level repair unless you are qualified.

  • Isolate power: Turn off the breaker and verify no voltage is present.
  • Visual PCB inspection: Remove the cover and inspect the main control PCB for burn marks, cracked components, or bulging capacitors near the power control section.
  • Check wiring to elements: Ensure no short circuits exist between element terminals and chassis ground. Repair any damaged insulation or wiring.
  • Do not bypass controls: Never bypass the triac or relays to force the element on.

Action: Replace the main control PCB with the correct Dimplex part. This repair should be performed by a certified technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Main Control PCB
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