Two downstairs radiators cold after boiler service

[john2k]

I had a Baxi engineer come and change pressure relief valve on my combi boiler and also recharged the vessel. But later I noticed that two radiators downstairs were not heating up at all. They were working correctly before. I assumed it's an air lock somewhere. So i went upstairs and turned off all the TRV's and turned all the downstairs ones that are heating up off too (except the corridor one as this seems like it's been pre-set and balanced with just a blank cover on top). After turning all radiators off by the TRV (Except the two cold ones and the corridor one), one of the other ones has started to heat up but the other one remains stone cold. The one that has now started to heat up (that wasn't at first) the TRV end of the pipe is not as hot as the other side pipe.

Any ideas what I can do to get this airlock out? Right now I only have the 3 radiators on and if i try to bleed them just water comes out - no air.

 

[Wayners]

Trv shut off pin jammed in?
Remove Trv top and manually push pin. Will it move in and out ok?
Plenty of YouTube videos showing you how.
Oh. Don't pull pin as they come out easily

 

[john2k]

Trv shut off pin jammed in?
Remove Trv top and manually push pin. Will it move in and out ok?
Plenty of YouTube videos showing you how.
Oh. Don't pull pin as they come out easily

On which one? The TRVs on all the radiators that I turned off are working because turning them to off has turned all those radiators off completely

 

[Harry Bloomfield]

On which one? The TRVs on all the radiators that I turned off are working because turning them to off has turned all those radiators off completely

No - TRV pins stick down/in, which means they shut off the flow until freed.

Easy to check - remove the head, and try to push the pin down into the valve, with the side of a pair of pliers, or similar. The pin should be able to be moved a couple of mm, against a strong spring. If not, it is stuck closed. Use a pair of pliers, to gently turn it, and ease it up. Pull too hard, and it will come all the way out, releasing water.

 

[Wayners]

Yeah. As above.

Pin stuck in on trv has shut radiator off.
Radiator will stay cold as no flow of hot water.
Really easy to check and fix.

 

[ericmark]

With mine, I get a warning on the head.

and the heads exercise the valves once a week.