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So I was finally able to get some time to play around with the boiler (set the overrun to 10 minutes).Could you (if installed) extend the pump overrun time to say 5 minutes, shut the ABV (if installed) and then open the zone valves manually once you shut the boiler down??.
You can set it all right but if you do decide to do the test ensure all air is vented first. It actually defaults to 5 mins but you can extend that to 10 or 15 minutes to do every thing at your leisure.
All you have to do after extending the overrun time is to ensure boiler running then turn roomstats down, the burner will stop firing and pump overrun commence.
View attachment 73026
After a short period, the radiator was quiet, and no kettling-like noises from the boiler (just the hum of the pump).
So my understanding is that the water continues to flow as normal during overrun, to help draw heat out of the heat exchange etc. I guess this rules out air ingress through the pump etc, and makes the main heat exchange the only remaining candidate. Correct?
Anything else worth considering before I start looking at quotes? Still going to be cheaper than a £2-£3k for a new boiler + labour