Possible Airlock

[Steve Thompson]

Hi

I recently emptied my radiators to move one. Once I filled them up I noticed the hot water from the taps goes hot and then mild and hot again, etc. This would imply there is an airlock somewhere.

What I don't understand is how an airlock is in the hot water pipes from emptying the radiators? They're on different pipes?

Can anyone answer this?

Thanks

 

[mcmoby69]

Google primatic cylinder. Evident by lack of separate f&e tank for central heating.

Ie one big tank feeding cylinder only.

 

[Deleted member 294929]

Have you got a combination boiler?

 

[Steve Thompson]

Yeah I do.

 

[Deleted member 294929]

Maybe when draining then filling you have aggravated the sludge and debris in the system and it's congregated in the secondary heat exchanger.

Is there a magnet on the return pipe?

 

[Steve Thompson]

Ok thanks. There is. I'll check it out today and see if it's caught debris