Chaffoteaux High Minimum Flow Threshold

Water heater only ignites when multiple hot taps are opened, not with a single tap.

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

Stiff or scaled flow sensor, Incorrect flow sensor calibration, Low mains water pressure, Oversized minimum power setting

Safety: Turn off power and water before removing flow components.

Clean flow sensor: Remove and clean the DHW flow sensor or hydraulic valve to ensure it moves freely at low flows.
Check inlet filter: Clean to reduce pressure drop.
Measure mains pressure: If pressure is low, consult the water supplier or consider a booster pump.
Professional adjustment: A technician may adjust minimum burner power and verify flow sensor operation.

Medium 3/5

DHW Flow Sensor / Hydraulic Valve

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