Riello
Internal Water Leak
Boiler is leaking water from underneath or from casing joints
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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
Corroded primary heat exchanger, Leaking pump seals, Dripping automatic air vent, Loose compression joints on flow/return
How to Fix / Troubleshooting
Safety: Isolate power and, if leak is significant, close the system isolation valves. Water may be hot.
- Identify source: Remove the boiler front panel and use a torch to locate the origin of the leak (pump, joints, heat exchanger, AAV).
- Tighten joints: Gently tighten any accessible compression fittings that are weeping. Do not overtighten plastic components.
- Replace AAV cap: If the automatic air vent is leaking from the top, the cap may be loose or the vent faulty. Tighten or replace as needed.
- Professional repair: Leaking heat exchangers or pumps generally require part replacement by a heating engineer.
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Repair Difficulty
Medium
3/5
Required Part
Primary Heat Exchanger
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