Kospel
Unstable DHW Temperature Control
Domestic hot water temperature fluctuates or is not hot enough
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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 flow rate, Mixing valve malfunction
How to Fix / Troubleshooting
Safety first: Hot water can cause scalding. Test temperatures carefully.
Steps to check:
- Check DHW setpoint: Ensure the DHW temperature on the Kospel control is set appropriately (e.g., 45–55°C).
- Stabilize flow: Avoid opening multiple hot taps simultaneously if the boiler is small. Maintain a steady flow at one outlet.
- Clean inlet filters: Remove and clean cold water inlet filters to ensure proper flow through the DHW heat exchanger.
- Descale plate exchanger: If water hardness is high and DHW performance has degraded over time, the plate heat exchanger may need professional descaling or replacement.
When to call a technician: Sensor replacement and plate heat exchanger descaling should be done by a qualified technician.
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Repair Difficulty
Medium
3/5
Required Part
Plate Heat Exchanger
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