Ideal Poor Circulation / Sludge in System

Boiler runs but radiators only get warm at the bottom or some stay cold

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

Sludge build-up in radiators, Partially blocked Ideal system filter, Pump running at low speed, Balancing issues with radiator valves

Safety first: Radiators can be hot; allow them to cool before removing bleed caps.

User checks:

Bleed radiators: Release trapped air from cold-at-top radiators and re-pressurise the system.
Open valves fully: Ensure all TRVs and lockshields are open, especially on cold radiators.
Check system filter: Confirm isolation valves on any Ideal System Filter are open. Do not dismantle the filter yourself.

If problems persist, a heating engineer should balance the system, clean the filter, and consider a powerflush.

Medium 3/5

Central Heating Circulation Pump

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