No water from one side of radiator pipe.

[MitchDoss]

Recently added a new radiator to a gravity fed system, gone to fit the radiator and noticed water is only coming out of one pipe, I wondered if it could be a blocked return pipe or possibly a blocked 3 port valve, just looking for any suggestions,

Thanks

 

[rpm]

editted
and the twenty five characters

 

[Basher]

Have you moved the manual lever on the 3 port valve to the 'open' position?

 

[MitchDoss]

Have you moved the manual lever on the 3 port valve to the 'open' position?

I have yes, didnt hear any change in the water and B side of the valve stayed cold

 

[Basher]

Maybe an airlock. I thought the idea was you move the lever on the 3 port before refilling the system, to help avoid such?

When you say "water only coming out of one pipe" do you mean literally pouring out of the end of the pipe when it's disconnected, but the pipe the other side of the radiator does not do the same? I would have thought an airlock more likely than a blockage. Other may have suggestions?

 

[MitchDoss]

Maybe an airlock. I thought the idea was you move the lever on the 3 port before refilling the system, to help avoid such?

When you say "water only coming out of one pipe" do you mean literally pouring out of the end of the pipe when it's disconnected, but the pipe the other side of the radiator does not do the same? I would have thought an airlock more likely than a blockage. Other may have suggestions?

Yes that's correct, one side water pours out, the other nothing apart from a little dribble

 

[Basher]

Yes that's correct, one side water pours out, the other nothing apart from a little dribble

I'm not a professional plumber, but I think the usual trick for airlocks is to stick a hose on the offending pipe (the one with no flow), connect the other end to a mains cold water tap, and give it a blast! Don't want to over fill the F&E tank though!

 

[MitchDoss]

I'm not a professional plumber, but I think the usual trick for airlocks is to stick a hose on the offending pipe (the one with no flow), connect the other end to a mains cold water tap, and give it a blast! Don't want to over fill the F&E tank though!

See I tried that and the hose just shot off which has really puzzled me

 

[Basher]

See I tried that and the hose just shot off which has really puzzled me

Wow. I didn't mean without a Jubilee clip (topical!) or something to hold it on.
Well maybe you are right about a blockage?
Are you sure there isn't a valve shut somewhere? Did you close any valves when you did the radiator installation, that you haven't opened since? There's not a lockshield valve on the rad. that you haven't opened? 🤪