Moccamaster
Incorrect Brew Temperature or Flow Pattern
Coffee tastes weak or under-extracted even with correct coffee amount
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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
Brew temperature too low due to failing thermostat, Scale buildup reducing water temperature, Misaligned outlet arm causing uneven saturation, Using incorrect filter or grind size
How to Fix / Troubleshooting
Safety: Use caution when measuring hot water temperature; avoid contact with hot metal and steam.
- Check brew temperature: Start a brew cycle with water only. After 1–2 minutes, collect water from the brew basket and measure with a food thermometer. Ideal brew temperature is typically around 92–96°C (197–205°F). Significantly lower temperatures indicate a thermostat or scale issue.
- Descale the machine: Run a full descaling cycle to restore proper heat transfer in the heating block.
- Inspect outlet arm: Ensure the outlet arm is correctly positioned over the center of the brew basket and that all holes are clear. Clean any blocked holes to improve spray pattern.
- Verify coffee setup: Use the recommended filter size and a medium grind suitable for drip brewing. Adjust grind slightly finer if extraction remains weak.
- Replace thermostat (if needed): If brew temperature remains low after descaling, test and replace the brew thermostat on the heating block.
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Repair Difficulty
Medium
3/5
Required Part
Brew Thermostat
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