Hamilton Beach Restricted Water Flow / Partial Clog

Coffee maker brews extremely slowly or takes much longer than normal to complete a pot.

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Possible Causes

Mineral scale in heater tube, Clogged reservoir outlet, Coffee oils and residue in brew basket outlet, Partially blocked drip stop valve

How to Fix / Troubleshooting

Safety first: Let the unit cool before disassembling the brew basket or reservoir.

Clean external flow paths:

  • Remove the brew basket and clean the outlet hole and drip stop mechanism with hot soapy water and a small brush.
  • Rinse the carafe lid thoroughly; some models route coffee through the lid.
  • Clean the reservoir outlet and any mesh screen.

Descale internally:

  • Run a 1:1 vinegar and water solution through a full brew cycle.
  • Pause halfway for 20–30 minutes, then resume.
  • Flush with 2–3 full reservoirs of clean water.

If brewing remains abnormally slow, internal tubing may be heavily scaled and the heater assembly may need replacement.

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Repair Difficulty

Easy 2/5

Required Part

Heater Tube / Internal Tubing
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