Klimosz 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 heating system, Blocked radiator valves, Lack of inhibitor in Klimosz system, Partially blocked return pipework

Safety: Turn off the boiler and allow radiators to cool before working on them.

Balance valves: Ensure both flow and return valves on each radiator are open and not stuck.
Power flush or clean: For heavily sludged systems, arrange a professional power flush and add corrosion inhibitor approved for Klimosz boilers.
Install filter: Fit a magnetic filter on the return to the boiler to capture ongoing sludge and protect the heat exchanger.
Monitor: After cleaning, check that radiators heat evenly from bottom to top.

Medium 3/5

Magnetic System Filter

Check Price on Amazon

We may earn a commission from links on this page.