E05
Dimplex Flow Temperature Sensor (NTC) Fault

Boiler shows E05; no heating or hot water; temperature reading on display is unrealistic or fixed

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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

Open-circuit or shorted Dimplex flow NTC sensor, Loose or corroded wiring to flow sensor on Dimplex PCB, Faulty Dimplex main control PCB reading sensor incorrectly

How to Fix / Troubleshooting

Safety first: Isolate power before touching any internal wiring or sensors.

User-level checks:

  • Reset the boiler: Power off at the fused spur for 30 seconds, then power on and reset via the control panel.
  • Check for obvious wiring damage: If your model allows front-panel access, visually inspect the cable from the flow pipe sensor to the Dimplex PCB for dislodged connectors. Do not alter wiring if you are unsure.

Professional repair:

  • Measure resistance of the Dimplex flow NTC sensor at known temperatures and compare to Dimplex specifications; replace if out of range.
  • Inspect and clean sensor connector pins on the Dimplex PCB.
  • Replace the Dimplex main control PCB if sensor and wiring are confirmed good but E05 persists.
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Repair Difficulty

Hard 4/5

Required Part

Dimplex flow NTC temperature sensor
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