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Where can I find it at that price?!?

Apologies for the delay in replying. Thanks for all contributions so far. Latest findings: Orange wire on zone valve getting 0 volts, was able to move lever below motor ninety degrees with my thumb and it moved smoothly out and back to rest position. Brown wire on zone valve is reading...

Thanks for the quick response, found two zone valves beside the cylinder. 'Valve 1' has a white wire that loops in and out connecting to a blue wire with no visible exposure point to test, It also has a grey wire which gave a reading of 241. 'Valve 2' has grey wire(reading 241) and a white...

Potterton Suprima 100L installed - When I trigger the HW to on it fires up from Static Red to Green quite happily and burner ignites, however when I trigger the CH side of things nothing happens at the boiler - LED remains static RED (Myson 2MEP 2c programmer panel in house - in case it's this...