Grant Sludge Build-Up in Radiators

Radiators are hot at the top but cold at the bottom, while the boiler appears to run 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 settling in radiators, Lack of inhibitor, Long-term operation without flushing, Poor system filtration

How to Fix / Troubleshooting

Safety: Radiators can be hot; use gloves and protect flooring when bleeding or removing radiators.

User actions:

  • Bleed radiators to remove air, although this usually affects tops rather than bottoms.

Engineer actions:

  • Check for magnetic sludge by placing a magnet on the radiator surface.
  • Powerflush the system and radiators to remove sludge.
  • Install or clean a magnetic filter on the return to the Grant boiler.
  • Add a suitable corrosion inhibitor to the system water.
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Repair Difficulty

Medium 3/5

Required Part

Magnetic system filter
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