Bunn Low Brew Temperature

Bunn coffee maker brews but the water is only lukewarm.

Advertisements

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.

Advertisements

Possible Causes

Thermostat out of calibration, Failing heater element (partial), Faulty temperature sensor, Incorrect voltage supply

How to Fix / Troubleshooting

Safety: Use caution when measuring hot water temperature.

Steps:

  • 1. Allow full warm-up: Ensure the brewer has been on long enough for the tank to reach temperature (15–20 minutes).
  • 2. Measure brew temperature: Use a thermometer at the sprayhead during brew. If significantly below spec, proceed.
  • 3. Verify supply voltage: Confirm the brewer is connected to the correct voltage. Low line voltage can reduce heater output.
  • 4. Test thermostat or sensor: Check the thermostat or thermistor for proper operation and replace if out of spec.
  • 5. Inspect heater: While rare, a partially failing heater can produce reduced output. Replace the heater if resistance is abnormal or if it overheats locally.
Advertisements

Repair Difficulty

Medium 3/5

Required Part

Tank Heater Element
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements