CTC
DHW Temperature Instability
Boiler frequently short cycles when providing hot water; temperature at taps fluctuates.
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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, Incorrect minimum burner power setting, Low flow rate through boiler
How to Fix / Troubleshooting
Safety: Allow hot water pipework to cool before handling.
- Check flow rate: Ensure taps are opened sufficiently to maintain the minimum flow rate required by the CTC boiler.
- Verify DHW setpoint: Avoid setting excessively high DHW temperatures which can cause overshoot and cycling.
- Inspect DHW NTC: Confirm the DHW sensor is correctly mounted and connected.
- Descale plate heat exchanger (technician): Remove and descale or replace the DHW plate heat exchanger if flow is restricted.
- Adjust burner modulation (technician): In the installer menu, check that minimum burner power is correctly set for stable DHW operation.
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Repair Difficulty
Medium
3/5
Required Part
DHW Plate Heat Exchanger
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