Glow-worm Sludge accumulation in radiators

Furnace runs but radiators only get warm at the top, 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 sludge in system, Blocked radiator bottoms, Inadequate system inhibitor, Blocked Glow-worm return filter

How to Fix / Troubleshooting

Safety: Radiators can be hot; allow to cool before working on them.

User steps:

  • Bleed radiators to remove air (this usually causes cold at the top, but is still worth checking).

Technician steps:

  • Check and clean any system filter on the return to the furnace.
  • Powerflush the heating system to remove sludge.
  • Refill with appropriate corrosion inhibitor.
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Repair Difficulty

Medium 3/5

Required Part

System Filter / Radiators
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