Worcester Bosch
Internal Water Leak
Water leaking from the bottom of the Worcester Bosch boiler casing.
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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
Leaking pump seals, Corroded primary heat exchanger, Leaking diverter valve or manifold, Dripping pressure relief valve
How to Fix / Troubleshooting
Safety first: Isolate power and, if leak is significant, close the cold water and heating isolation valves. Place a container under the boiler to catch drips.
User actions:
- Do not remove the boiler case yourself; observe where water appears and report to an engineer.
Engineer actions:
- Remove the front panel and inspect all internal joints, pump, diverter valve, and manifolds for signs of leakage.
- Check the pressure relief valve and discharge pipe for continuous dripping; replace valve if necessary.
- Replace any leaking components (pump, diverter, heat exchanger) using genuine Worcester Bosch parts.
- Dry the appliance thoroughly and test for further leaks under operating pressure.
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Repair Difficulty
Hard
4/5
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