Radiators warm up randomly

Joined
13 Nov 2008
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Location
Edinburgh
Country
United Kingdom
Some of the radiators (5) in the house decide randomly when to warm up. Sometimes they are mild, cold, or only one part of the double radiator works. A radiator which is cold to the touch for days can kick into life. There are only 3 radiators in the house which warm up without fail each time.

I have fully flushed & bled the system and it worked great for about a week. I have a Ariston Condensing Combi which is only around 2 years old. The system had been working fine before summer.

I have flushed all radiators in the house one at a time until the water runs clean. Also bled all of them. I am currently running the system with a sludge cleaner to see if that helps.

Can anyone help?
 
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is it were stick trvs, would the system have worked fine for a week after the last flush & bleed?
 
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