Chaffoteaux
Intermittent DHW Temperature Control
Hot water temperature fluctuates between hot and cold during shower use, without any error code.
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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
Partially blocked plate heat exchanger, Unstable DHW flow rate, Faulty DHW NTC sensor, Gas valve modulation issues
How to Fix / Troubleshooting
Safety first: Risk of sudden temperature changes causing scalding. Advise users to be cautious.
User-level checks:
- Ensure the shower or tap is fully open to maintain a stable flow.
- Avoid mixing hot and cold at the tap excessively; set a moderate hot flow and adjust gradually.
Technical checks (qualified personnel):
- Check DHW flow rate against boiler specifications; clean inlet filters and flow restrictors.
- Descale or replace the plate heat exchanger if partially blocked.
- Verify DHW NTC sensor readings and replace if unstable.
- Check gas valve modulation and combustion settings.
After repair, test hot water at various flow rates to ensure stable temperature.
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Repair Difficulty
Hard
4/5
Required Part
Plate Heat Exchanger
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