Boiler shows A14, no hot water, heating may still work

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

Stuck DHW flow switch, Blocked DHW inlet filter, Faulty DHW flow sensor (turbine), Wiring fault between sensor and PCB

Safety: Isolate power and close cold water inlet before removing any DHW components.

Steps:

Check that the cold water isolation valve to the boiler is fully open.
Clean the DHW inlet filter/strainer if accessible.
A technician should remove and inspect the DHW flow switch or turbine sensor for debris or limescale; clean or replace as needed.
Verify the electrical connection from the flow sensor to the PCB.

Medium 3/5

DHW Flow Sensor

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