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Thanks both Gasguru - yep did think about that but just seem an expensive way to get the ball and plate [£57] when adaptor plates are less than £10 ChrisR - glad not just me then. If the ball or ball and arm have come off spindle assume that they cannot escape the valve body and get stuck...

Guys - wondering if my ball has come off :shock: Removed power head and checked spindle as you suggested and there was a definite tight spot approaching port A (CH). Gave it a gentle wiggle with fingers back and forth few times until felt free. Refitted power head and tried again – no joy...

Thanks all for advice Twgas:Will remove head and check spindle turns okay Namsag: Take your point Suppose I was hoping for a mode of electrical failure that would cause valve to hunt or hold open rather than mechanical failure within valve body. Do the valves themselves often fail like...

Hi all – wondering if someone may be able to help diagnose a problem with Honeywell v4073a mid position valve. Have checked the posts but still struggling. Problem It has been in place working fine for about 8 years [I replaced a switchmaster valve – rest of control system is still...