E14
Defro
DHW Flow Sensor / Turbine Fault
Boiler displays E14, DHW demand not recognized or boiler runs for heating when only hot water is requested.
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Safety Warning
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.
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Possible Causes
Stuck or scaled DHW flow turbine in Defro hydraulic block, Faulty DHW flow switch or Hall sensor, Blocked inlet filter on Defro cold water connection, Wiring fault between DHW sensor and PCB
How to Fix / Troubleshooting
Safety: Turn off power and close the cold water inlet before opening DHW components.
- Clean inlet filter: At the cold water inlet to the Defro boiler, remove and clean any mesh filter to remove debris and scale.
- Access DHW flow sensor: Locate the DHW flow turbine or flow switch in the Defro hydraulic block. Carefully remove it following the manual.
- Descale turbine: Soak the turbine in descaling solution if heavily scaled, then rinse thoroughly. Ensure it spins freely when blown on.
- Check sensor connection: Ensure the Hall sensor or microswitch on the flow unit is properly connected to the wiring harness.
- Reassemble and test: Refit the components, open the cold inlet, check for leaks, restore power, and run a hot tap. If E14 persists, the flow sensor assembly may need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Defro DHW flow sensor turbine
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