Baxi Supply Interaction / Flow or Pressure Drop

Heater starts normally but shuts down as soon as another large water appliance (e.g., washing machine) is used.

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

Mains water pressure drop below Baxi minimum, Shared gas line causing pressure drop, Undersized supply pipes, Flow sensor misreading at low pressure

Safety: None specific beyond normal precautions.

Steps:

Test individually: Run the heater alone and then with other appliances to confirm the interaction.
Check stop valves: Ensure all isolation valves on water and gas supplies are fully open.
Professional: A plumber or gas technician should assess pipe sizing, static and dynamic pressures, and possibly install pressure regulators or upgrade pipework.

Medium 3/5

Water Flow Sensor / Supply Pipework

Check Price on Amazon

We may earn a commission from links on this page.