Swan Underheating / Temperature Regulation Fault

Swan coffee maker brews but the coffee is lukewarm or not hot enough.

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

Weak heating element, Thermostat opening at too low a temperature, Scale buildup on heating plate or boiler, Faulty temperature sensor (thermistor)

How to Fix / Troubleshooting

Safety first: Unplug the unit and let it cool before handling.

Descale thoroughly:

Run at least one full descaling cycle to remove limescale from the heating system. Scale acts as insulation and reduces heat transfer.
Clean the warming plate with a non-abrasive cleaner to remove coffee residue that can affect heat transfer to the carafe.

Check brew volume and settings:

Ensure you are not brewing with a very small water volume on a large machine, as this can cool quickly.
Verify that any "eco" or low-temperature settings are not enabled.

Advanced checks:

Measure the temperature of coffee in the carafe immediately after brewing; typical should be around 80–85°C.
If significantly lower, test the heating element and thermostat for correct resistance and operation, replacing as needed.

Repair Difficulty

Medium 3/5

Required Part

Heating Element / Thermostat

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