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What does an E9 flow sensor fault actually mean?
The boiler’s showing an E9 error and heating’s stopped working, but I don’t really understand what a flow sensor does and what this is going to cost to fix?
Expert Trade Answers
"It basically means the Boiler is NOT Detecting the flow of Water - in short, the Flow Sensor is defective and requires replacement."
Answered on 25th Mar 2026 - Member since May 2021 -
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"Normally means the temperature limiter has been tripped , it could be a few things , flow sensor , pump , flow sensor wiring , , hope this helps."
Answered on 25th Mar 2026 - Member since Feb 2026 -
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"The boiler isn’t sensing the water flow properly, so it shuts down as a safety precaution. It’s usually something simple like low pressure, a blockage, or a faulty sensor."
Answered on 25th Mar 2026 - Member since Feb 2026 -
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"Boiler is not recognising hot water demand, new flow sensor maybe required."
Answered on 25th Mar 2026 - Member since Mar 2026 -
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