Remeha Sludge accumulation in radiators

Radiators are hot at the top but cold at the bottom

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.

Possible Causes

Corrosion sludge in system, Lack of inhibitor in heating water, Poor circulation, Partially blocked radiator valves

Safety first: Allow radiators to cool before working on them. Protect floors from dirty water.

Bleed radiators: Release any trapped air from the top of each radiator. If water is very dark, sludge is likely present.
Try balancing: Adjust lockshield valves to ensure even flow through all radiators.
Engineer tasks: Power-flush or chemically clean the system, clean or replace heavily sludged radiators, add corrosion inhibitor, and check pump performance.

Medium 3/5

Radiator (System Component)

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