Dimplex Insufficient Heating / Under-Temperature

Water is warm but not hot enough, even at maximum temperature setting

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

One of multiple heating elements failed, Low supply voltage, Excessive flow rate through heater, Incorrect kW rating for demand

Safety: Isolate power before testing elements.

Check flow rate: Reduce the flow at the hot tap or shower to see if temperature increases. If so, the heater may be undersized or flow too high.
Measure supply voltage: Confirm voltage at the unit is within Dimplex specifications under load.
Test each element: If the unit has multiple elements, test each for continuity. Replace any failed element.
Review sizing: Compare heater kW rating to usage (e.g., multiple showers). If undersized, consider upgrading the unit.

Medium 3/5

Heating Element Assembly

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