Potterton Performa 30HE Combi Condensing Boiler

Joined
12 Dec 2007
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Location
Essex
Country
United Kingdom
I have the above boiler which was working but slowly. I drained the system and put de-sludger in it. Left for a week. Drained again and added inhibitor.

Boiler fires, gets fully warm. all radiators bled properly and are full. Pressure is perfect on boiler. Flow is piping hot but return is freezing. Firstly none of the rads got hot. Then slowly after a day or so they started warming up. Then, a new development. Now the rads that are open (only opened 2 to try and force round) get warmish then after about two hours the boiler goes in to lockout mode. You can restart it and it follows the above pattern again exactly each time till the lock out.

Thought of the pump, but the hot water hits the flow in the old tank cupboard in seconds.

Any ideas what the problem could be? Poss. solutions!
 
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