E16
Oso
Thermostatic Mixing Valve / Outlet Overtemperature Fault
Oso water heater shows E16 and limits output; may be associated with anti‑scald protection.
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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
Stuck or scaled thermostatic mixing valve, Faulty outlet temperature sensor, Incorrect mixing valve setting, Blocked cold feed to mixing valve
How to Fix / Troubleshooting
Safety first: Hot water can cause scalding. Turn off power and allow water to cool before dismantling the mixing valve.
- Check outlet temperature: Measure hot water temperature at a tap. If it exceeds safe limits, the mixing valve may be stuck.
- Inspect cold feed: Ensure the cold supply to the Oso mixing valve is open and not blocked by debris or a closed valve.
- Service the valve: Isolate hot and cold supplies, remove the mixing valve per Oso’s instructions, and descale internal components. Replace seals as needed.
- Reset settings: Adjust the valve to the recommended outlet temperature (typically 50–55°C) and lock the setting if possible.
- Sensor check: If the valve is fine but E16 persists, test and replace the outlet temperature sensor.
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Repair Difficulty
Medium
3/5
Required Part
Oso thermostatic mixing valve
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