Fondital Insufficient DHW Capacity / Flow Limitation

Boiler does not produce hot water when more than one tap is opened

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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

Flow restrictor in Fondital boiler limiting output, Scaled DHW plate heat exchanger, Low incoming cold water pressure, Gas rate set too low

How to Fix / Troubleshooting

Safety: None specific, but avoid relying on hot water for critical tasks until resolved.

User checks:

  • Use one tap at a time: Test hot water with only one outlet open to see if temperature improves.
  • Check cold pressure: Ensure cold water pressure at taps is adequate.

Technician actions:

  • Check and clean the DHW inlet filter and any flow restrictor.
  • Descale or replace the DHW plate heat exchanger.
  • Verify gas valve settings and maximum DHW output on the Fondital PCB.
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Repair Difficulty

Medium 3/5

Required Part

DHW Plate Heat Exchanger
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