weird boiler - any idea which thing i should try to twiddle?

[bimble]

Thank you will do, I hope so too.

 

[WouldBe]

ok awesome, report back with what yer man says though! hope it isnt too expensive!

Wouldn't surprise me if it's an airlock.

 

[bimble]

He has completely fixed it, pumping out the lovely toasty heat now what a joy. It was to do with the pressure dropping to zero but why that happened in the first place idk yet.

 

[WouldBe]

He has completely fixed it, pumping out the lovely toasty heat now what a joy. It was to do with the pressure dropping to zero but why that happened in the first place idk yet.

Pressure will drop when you bleed the radiators.