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Flow gets hot quicker and is hotter than return. No error messages

Thanks for your assistance. I am getting the gas safe installer to check out the installation

This shows the original piping to Potterton Prima boiler flow left and return right. Plumber has crossed them over to connect Baxi boiler.

On reflection I think they have installed correctly

Ian got me thinking. Yes pump is definitely pumping right direction

Thanks John I have removed the pipe already. Will be talking to Baxi tomorrow to ensure the boiler has not been compromised

Also special thanks to gas112 of course. Hope I have not missed anybody out. Such a relief to know it's a simple fix. Should I ask Baxi whether this could have had a detrimental effect on the boiler. Once again many thanks to all

Jesus. Bloody idiots. Thankyou so much Ian. Could that have had any adverse effects on the boiler?

This is the set up

The previous boiler worked fine for 25 years. Boiler vent feed pump set up

Yes it is down

Tested with a magnet. No issues

No 8 years old. Gr8 pump very quiet

Pump speed lowered to 2.5 with no improvement

Recently replaced my 25year old Potterton Prima F boiler with a heat only Baxi 619 Heat. From day 1 had air in upstairs radiators. The boiler was a straight replacement. It is an open vented system servicing 15 radiators on 2 floors. Configuration is Boiler Vent Feed Pump. Is it fair to say the...

Many thx for pointing that out. Hopefully deleted now

I have a few things to go at now thanks to Johntheo. If still have air ingress I could look at joint feed/vent as per your layout. Looks a very simple switch

The expansion tank is approximately 2m above the pump. The water level in the expansion tank is 2inches above feed pipe. Does that help diagnosis?

Will do much appreciated

2.5