Baxi Intermittent Lockout Due to Marginal Conditions

Baxi water heater frequently needs manual resetting to restore operation, even though hot water is available between resets.

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

Borderline flue or air supply, Slightly blocked burner or heat exchanger, Intermittent sensor connection, Early-stage fan or gas valve failure

Safety: Do not repeatedly reset without investigating; this can mask a developing safety issue.

Steps:

Record patterns: Note when lockouts occur (time of day, weather, demand level) to help diagnosis.
Check flue terminal and air intake: Ensure they remain clear at all times.
Inspect wiring: Look for loose or corroded sensor connectors and reseat them.

Professional: A full service by a Baxi-trained technician (cleaning burner, checking sensors, verifying combustion) is recommended.

Hard 4/5

Burner and Sensor Assemblies

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