Dimplex Short Cycling / Control Instability

Water heater turns on and off rapidly (short cycling) without stable operation

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.

Possible Causes

Faulty flow sensor giving intermittent signal, Loose electrical connections, Oversensitive temperature sensor placement, Control PCB fault

Safety: Isolate power before tightening or reseating components.

Check flow sensor: Clean and inspect the flow sensor for debris or sticking. Replace if intermittent.
Tighten terminals: Tighten all power and sensor terminals on the PCB and at the elements.
Secure sensors: Ensure NTC sensors are firmly attached and not moving with water flow.

Note: If short cycling persists, the control PCB may require replacement.

Medium 3/5

Flow Sensor / Main Control PCB

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