E14
ACV
DHW Overtemperature / Anti-Scald Protection
Boiler shows E14, DHW temperature overshoots or boiler cycles rapidly on hot water
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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
Scaled DHW heat exchanger, Faulty DHW NTC sensor, Sticking DHW thermostatic mixing valve, Incorrect parameter settings
How to Fix / Troubleshooting
Safety first: Risk of scalding. Test hot water temperature carefully and warn occupants.
- Check DHW setpoint: On the ACV control panel, verify the DHW temperature is not set excessively high.
- Run hot water: Open a hot tap fully and observe if the temperature stabilizes or fluctuates. Note any very hot bursts.
- Descale fixtures: Limescale in taps and shower mixers can affect temperature. Clean or descale aerators and shower heads.
- Professional service: A technician should descale or replace the DHW plate heat exchanger or tank-in-tank coil, test the DHW NTC, and check the thermostatic mixing valve on ACV storage models.
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Repair Difficulty
Medium
3/5
Required Part
DHW Plate Heat Exchanger
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