There are few things more frustrating than a heating system that refuses to warm the house. If your radiators are cold at the bottom, certain rooms refuse to heat up, or your boiler is making strange gurgling noises, you may be dealing with a blockage in your central heating pipes.
Blockages are usually caused by sludge (a mix of rust and debris), limescale, or air pockets. While severe blockages require professional intervention, many minor to moderate issues can be resolved with a bit of DIY know-how. how to unblock central heating pipes