Oso
Reduced Heating Capacity / Partial Element Failure
Oso water heater produces insufficient hot water; runs lukewarm or cool after a short time.
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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
One of multiple elements failed, Heavy limescale on element reducing heat transfer, Thermostat set too low, Faulty mixing valve blending too much cold
How to Fix / Troubleshooting
Safety first: Isolate power and allow the cylinder to cool before removing any components.
- Check thermostat setting: Ensure the Oso thermostat is set to the recommended temperature (usually 55–60°C).
- Test recovery: After a full reheat cycle, measure hot water temperature at a tap. If it is low, suspect element or scale issues.
- Inspect elements: On multi‑element models, test each element’s resistance and replace any failed units.
- Descale element: In hard water areas, drain the cylinder to below the element, remove it, and descale or replace if heavily coated.
- Check mixing valve: Verify the thermostatic mixing valve is not set too low or stuck partially open on the cold side.
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Repair Difficulty
Medium
3/5
Required Part
Oso immersion heating element assembly
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