E16

Dimplex Safety Thermostat / Overheat Cut-out Tripped

Boiler displays E16; safety lockout; may be accompanied by high temperature reading

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.

Possible Causes

Tripped manual-reset Dimplex overheat thermostat, Blocked circulation through Dimplex primary heat exchanger, Air lock in system, Failed Dimplex pump

How to Fix / Troubleshooting

Safety first: Allow the boiler to cool completely before attempting any reset. Do not repeatedly reset an overheating boiler.

User steps:

Check system pressure: Ensure pressure is within the recommended range.
Bleed radiators: Remove air from radiators to improve circulation.
Reset overheat stat (if user-accessible): Some Dimplex models have a manual reset button under the front panel. With power off and the boiler cool, press the reset button once. Restore power and observe operation.

Professional actions:

Investigate cause of overheating (pump failure, blockage, scaling).
Replace the Dimplex overheat thermostat if it trips repeatedly without clear cause.

Repair Difficulty

Medium 3/5

Required Part

Dimplex overheat thermostat

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