De Dietrich Sludge / Poor Heat Transfer in Emitters

Radiators are hot at the top but cold at the bottom, furnace runs continuously

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 buildup in radiators, Dirty system water in De Dietrich heating circuit, Blocked radiator valves, Insufficient system flushing

Safety: Allow radiators to cool before working on them.

Steps:

Bleed air: First, bleed radiators to remove air.
Check valves: Ensure both flow and return valves are open and not stuck.
Manual flush (single radiator): For a badly affected radiator, isolate it, remove it, and flush it outside with a hose until water runs clear.

Professional help: A full system power flush and inhibitor dosing should be carried out by a heating engineer.

Medium 3/5