Perplexed - one for the plumbers

Bit of a tip Greig, I don't know If you've already done this, apologies if so..

When your Venting the rads just crack open the TRV only, don't open the Other valve, then vent it.
Once vented then fully open both valves.
It sounds like you may of fully opened both valves to vent and that's how the air has made it elsewhere into the system.
 
Followed this with interest as I'm having to constantly top up the system daily as the pressure keeps dropping and I've also got 1 rad that's 50/50 hot/warm but the pipes leading to it are red hot!

I think we should have a Plumbers Corner sticky 👍🔧🚽🚿
presure vesell
 
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