Chaffoteaux
DHW Flow Control / Modulation Issue
Furnace cycles on and off rapidly when providing domestic hot water, with noticeable temperature swings.
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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
Faulty DHW flow sensor, Incorrect minimum burner setting, Blocked plate heat exchanger, Inadequate cold water flow
How to Fix / Troubleshooting
Safety: Water temperature may fluctuate; avoid scalding.
- Maximize flow: Fully open the hot tap to ensure adequate flow through the furnace.
- Clean aerators: Remove and clean tap and shower aerators to improve flow.
- Check DHW sensor connection: Ensure the DHW NTC and flow sensor connectors are secure.
- Professional adjustment: A technician can check burner modulation and descale the plate heat exchanger if necessary.
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Repair Difficulty
Medium
3/5
Required Part
DHW Flow Sensor / Turbine
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