No heating after radiator ad

Hello. I have glowworm micron and unvented hw cylinder. I installed a radiator in garage conversion by fitting tees in flow and return pipes just above a boiler. After refilling of system and bleeding pump and all radiators they are not getting warm and boiler is overheating. What may cause that?

Asked by Roman on 27th Mar 2024
Expert Trade Answers
"You have now installed a radiator which is short circuited your heating system. this is causing the boiler to overheat because you now have only that one radiator working."
Answered on 27th Mar 2024 - Member since Jan 2023 - report
"Hi,

The system has an airlock or a blockage somewhere preventing flow.

On a separate note, radiators should only be tee'd off the radiator circuit itself and not the boiler 'primaries' as this will effect the boiler, both in flow, controllability and temperature sensing.

Regards
Gasworks Ltd"
Answered on 23rd Apr 2024 - Member since Feb 2024 - report
"Most likely it’s and air look but if you tee your pipe just above the boiler it need balancing"
Answered on 28th May 2024 - Member since Jul 2022 - report
"Looks like there is air system from boiler to pipe work above boiler try to release air from above boiler at highest level"
Answered on 27th Mar 2024 - Member since Feb 2024 - report
"Sounds like a blockage in the system causing overheating."
Answered on 8th Apr 2024 - Member since Jul 2019 - report
"It will not work as flow from radiator needs to be fitted after the pump and zone valves ,in theory it thinks its got 2 return pipes"
Answered on 2nd Jun 2024 - Member since Nov 2018 - report
"You have done something wrong when plumbing the rad in call a heating engineer to have a look"
Answered on 28th Mar 2024 - Member since Oct 2022 - report
"This type of installation is not usually attempted by non professionals.
The level of variables that could be involved are too many to practically and safely offer help by text/email.
We would suggest you telephone for professional assistance."
Answered on 27th Mar 2024 - Member since Aug 2023 - report
"It could be a simple as an air lock in the boiler. But I would strongly suggest getting an engineer to attend and take care of your issue"
Answered on 27th Mar 2024 - Member since Jan 2020 - report
"U have tees in wrong side of pump, needs to take flow to pump"
Answered on 27th Mar 2024 - Member since Aug 2023 - report
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