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The boiler is fixed!! I checked the pump impeller which was mint. Then I checked the resistance of both NTC's (with a different meter) and both read 11K6 cold. I removed the diverter actuator which appeared to be working normally and checked the valve itself was free moving ie. I could push...

I don't know why the meter wouldn't register the resistance but it was the only one I had that was in calibration. I've got several others (out of cal) I can try at the weekend. I'll see if I can record and graph the flow and return temps at the weekend and I'll let you know what I find in the...

I didn't strip the pump to check for dirt but I flushed the boiler with fresh water through the connections below the boiler on the CH return and out of the CH flow pipe and pump drain with all rads shut off. I removed the plate HE and looked in through the primary water entry and exit holes I...

Thanks for the replies guys, I assume getting Biasi out on a Sunday would be a no- go so I'd like to try and sort this myself. The only checks I did on the DV were to check the CH flow & return pipes whilst drawing hot water and they where cold, also the pin to the micro switch was functioning...

My old non condensing Biasi and rads where mains flushed and run for a month with X400 in system, then mains flushed 1 rad at a time in both directions just before the boiler was changed for a new condensing job. After fitting the new boiler the system was again flushed and X400 added. I was...