Issues with central heating system. Radiators only get warm.

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Hi.

I recently purchased a new home in the summer and firstly replaced all of the radiators apart from two vertical ones as the old ones were very old and grotty. My boiler is a glow worm ultracom2 30cxi which is 4 years old. Initially upstairs radiators were getting hot and downstairs cool. I have balanced the system the best I can and upstairs radiators are fairly warm. Downstairs are Luke warm with some slightly hotter. Even after two hours of operation they are not much better.

I had the heating on for four hours and it only raised the temperature in the room to 12 degrees from 7.

I have set the central heating temperature to 70 degrees and it appears to get up to temperature quickly then rapidly drops to 45-50 degrees and this is repeated frequently. I believe this is called short cycling.

My flow pipe at the boiler gets hot very fast but return pipe stays cool and gets Luke warm after an hour or so.
I have tried turning off all radiators and testing one at a time and they all get hot when used individually with all others turned off via the trv.

I have two young children and we are all fed up of living in a cold house. Any suggestions would be greatly appreciated.
 
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Thanks for the response. Looking at the manual the boiler has an automatic bypass which can be adjusted. Would you suggest I close it a little and see if this has any impact?
 
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Have you considered calling a heating professional if you are fed up being in a cold house?

Tony
 
Hi. Will check beneath the boiler.

Tony I have had a gassafe engineer round and he didn't really seem to check much and said I should have a power flush. But in speaking to others they have said as there is a flow when i have test rads individually that it may be unlikely to be a blockage.
 

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