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Too modest by half matey :D Good call.

Update on this, and a fault found. So, it is with profound embarrassment I admit that, to test the flow leg from the f & e wasn't blocked, I drained down, then removed the pump from the flow pipework, as well as the 3-port immediately above it. Then I fabricated a basic length of pipe in its...

Good call boys, that's my next move - remove the pump and see what comes out of the gate valve on the suction side when I carefully re-open it. I'll keep you posted. Thanks, Mike

Thanks fella, will try. I'm deffo erring to pump failure, but we'll see for sure. Mike

Update on this....I re-checked the pump bleed valve, and re-checked the RV35 bleed points. Power off, pump bleed valve removed and checked for easy rotation of pump spindle. Free as a bird. Power on, spindle is rotating like a good 'un. But, pump is faintly buzzing and its body soon gets warm...

Air initially, then some brackish looking primary fluid...

6 weeks training will not convince anyone out there that you're competent, sadly. Your intentions are very encouraging and honourable, and in another time you'd be snapped up by an experienced plumber or contractor where you'd be put to work covering the basics initially then progressing and...

Ta muchly, I did that already. Yep there are two RV35s, both on vertical 15mm pipework, though one of 'em hasn't got the slotted head to it. Bleed screw on the pump was also loosened, a little water came out of the pump but that's all. Give the pump body a little knock to dislodge any debris...

No doubt this has been asked plenty of times, please excuse my ignorance in not finding a suitable thread on this so far. Vented central heating and hot water system, Y plan, Grundfos Selectric 15-50 circulating pump.... Boiler (glow worm) making some knocking and banging noises. My...