DIY Doctor UK DIY Forums

[b]Our Megaflow system, with a Valiant ecotec boiler, is two years old. A few months ago the pump was replaced because of debris inside the pump. The system was powerflushed with the new pump and radiator valves. Now, out of eleven previously working radiators, only two heat up and are lukewarm.:cry: However, the boiler and water system works perfectly well.
Any suggestions would be gratefully accepted.
Many thanks. [/b]

Check pump is running, vent pump and radiators.

Let me know if this does anything.

Is the new pump actualy working. If you lightly hold flow pipe from boiler, does it feel hot. Has pump been bled.
Are rad valves open.
Are TRV's on rads stuck.
Have rads been bled.
Has room stat been turned down.