Moccamaster
Electromagnetic Noise Without Water Movement
Machine produces a humming sound but does not heat or pump water
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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
Partially energized heating element with open circuit, Loose internal connection arcing, Faulty switch contacts vibrating, Foreign object vibrating against heating block
How to Fix / Troubleshooting
Safety: Unplug immediately if unusual noises occur. Do not continue operating.
- External check: Ensure nothing external is touching or vibrating against the machine.
- Open base: Remove the base cover and inspect for loose components or wires touching the heating block.
- Check connections: Tighten all spade connectors and ensure they are fully seated.
- Test heating element: Measure resistance across the element. If it is open or significantly out of spec, replace the heating block assembly.
- Inspect switch: Replace the on/off switch if contacts are buzzing or arcing.
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Repair Difficulty
Hard
4/5
Required Part
Heating Element Assembly
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