Beretta
Unstable Domestic Hot Water Temperature
Hot water temperature fluctuates between hot and cold when using taps or shower.
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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 plate heat exchanger, Faulty DHW NTC sensor, Inadequate minimum flow rate through boiler, Sticking gas valve modulation
How to Fix / Troubleshooting
Safety: Risk of scalding; test water carefully.
- Run a single tap fully: Avoid mixing with cold while testing. Ensure flow is strong enough to keep the boiler firing.
- Clean tap/shower filters: Remove and clean aerators and shower heads to improve flow.
- Technician – descale plate heat exchanger: Remove and descale or replace the Beretta plate heat exchanger.
- Check DHW NTC: Test and replace the DHW temperature sensor if readings are erratic.
- Technician – gas valve modulation: Verify correct modulation and replace the gas valve if it sticks.
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Repair Difficulty
Hard
4/5
Required Part
Plate Heat Exchanger
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