Safety: Unplug the coffee maker and allow it to cool completely before opening the base.

Confirm symptom: Fill the water reservoir and turn the unit on. If the indicator light comes on but the water remains cold after several minutes, proceed with internal checks.
Access the base: Remove the screws on the underside and carefully lift off the base cover. Note wire routing and take photos for reference.
Inspect wiring: Check all spade connectors to the heating element and thermostats on the aluminum heating block. Reseat any loose connectors and look for signs of burning or corrosion.
Test the heating element: Disconnect the element leads and measure resistance with a multimeter. A very high or infinite reading indicates a failed element. Replace the heating block/heating element assembly if open.
Check thermal cutoff and thermostat: Locate the thermal cutoff and brew thermostat attached to the heating block. Test each for continuity. Replace any open (non-continuous) device with the correct Moccamaster-rated part.
Reassemble and test: Reinstall the base, ensuring all wires are secured away from hot surfaces. Test the unit with water only.

Power light turns on but water does not heat or brew

Possible Causes