ACV
Unstable DHW Temperature Control
Domestic hot water temperature fluctuates between hot and cold
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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 plate heat exchanger, Faulty DHW NTC sensor, Sticking diverter valve, Inadequate flow rate
How to Fix / Troubleshooting
Safety first: Risk of scalding. Test water carefully and warn users.
- Stabilize flow: Open the hot tap to a steady, moderate flow. Avoid very low or very high flow rates.
- Clean aerators: Remove and clean tap and shower aerators to ensure stable flow.
- Check cold inlet filter: On ACV combi models, the cold inlet often has a filter. A technician should clean this and the plate heat exchanger.
- Professional diagnosis: A technician should test the DHW NTC, inspect and descale the plate heat exchanger, and check the diverter valve operation.
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Repair Difficulty
Medium
3/5
Required Part
DHW Plate Heat Exchanger
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