Chaffoteaux
Sludge Build-Up in Radiators
Radiators are hot at the top but cold at the bottom, while the boiler appears to operate normally.
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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 in system water, Lack of inhibitor, Long-term operation without flushing, Blocked radiator bottoms
How to Fix / Troubleshooting
Safety first: Radiators may be hot; allow them to cool before removing any components.
User-level checks:
- Bleeding radiators will not usually fix cold bottoms, but you can bleed to ensure no trapped air.
Technical checks (qualified personnel):
- Remove and flush affected radiators outside using a hose to clear sludge.
- Consider a full system powerflush with appropriate chemicals.
- Install or clean a magnetic filter on the return to the boiler.
- Add corrosion inhibitor to the system after flushing.
Improved radiator performance will reduce boiler cycling and improve efficiency.
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Repair Difficulty
Medium
3/5
Required Part
Magnetic System Filter
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