Remeha
Sludge accumulation in radiators
Furnace display shows normal operation but radiators are only warm at the top and cold at the bottom
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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
Corrosion products settling in radiators, Lack of inhibitor in system water, Long-term operation without flushing, Narrow-bore pipework partially blocked
How to Fix / Troubleshooting
Safety first: Allow radiators to cool before working on them.
- Check multiple radiators: If many radiators are cold at the bottom, the system likely has sludge.
- Isolate and flush: For individual radiators, close valves, remove the radiator, and flush it outside with a hose until water runs clear.
- System flush: For widespread issues, arrange a professional power flush of the entire system.
- Add inhibitor: After flushing, add a suitable corrosion inhibitor to protect the system.
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Repair Difficulty
Medium
3/5
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