Elnur
Unstable DHW Temperature
Domestic hot water temperature fluctuates or is not hot enough (on Elnur systems providing DHW).
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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 sensor, Incorrect cylinder thermostat setting, Scale on immersion heater, Flow rate too high through heat exchanger
How to Fix / Troubleshooting
Safety first: Isolate electrical supplies to any immersion heaters before working on them.
- Check thermostat settings: Ensure the cylinder or DHW thermostat is set to an appropriate temperature (typically 55–60°C).
- Inspect DHW sensor: Confirm the DHW NTC or thermostat is firmly attached to the cylinder or pipe and wired correctly.
- Reduce flow rate: If using an instantaneous electric boiler for DHW, reduce the flow rate at the tap or via a flow restrictor to allow adequate heating.
- Descale immersion heater: In hard water areas, scale can insulate the element. Remove and descale or replace the immersion heater as needed.
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Repair Difficulty
Medium
3/5
Required Part
DHW Thermostat / NTC Sensor
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