Baxi Short Cycling Due to Flow or Sensor Issues

Water heater repeatedly starts and stops (short cycling) during hot water use, causing fluctuating temperature.

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.

Possible Causes

Flow rate below minimum due to restricted aerators, Partially blocked plate heat exchanger, Faulty flow sensor on Baxi water module, Oversensitive temperature sensor placement

How to Fix / Troubleshooting

Safety: Beware of sudden temperature changes.

Steps:

Clean tap aerators and shower heads: Remove and descale them to restore proper flow.
Check inlet filter: Clean the Baxi inlet filter to ensure adequate flow.
Observe burner: Watch the burner through the inspection window (if provided) to confirm it is cycling off and on. Note any error codes.
Professional: A technician may need to descale or replace the plate heat exchanger and verify sensor readings.

Repair Difficulty

Medium 3/5

Required Part

Water Flow Sensor / Plate Heat Exchanger

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