They wont have been fitted the wrong way round , they were probably the right way round, then when your installer fitted the new boiler they swapped the flow and return around as it was easier for them so now the zone valves are the wrong way round
I came across this post looking for solutions to the same problem... Thanks for all the support on here - my two Drayton valves were also the wrong way around (no arrows on the body, had to look in the installation manual)
I came across this post looking for solutions to the same problem... Thanks for all the support on here - my two Drayton valves were also the wrong way around (no arrows on the body, had to look in the installation manual)
Glad you found a fix. It is a bit weird reading through posts from 2018, but your post will, hopefully reassure/help other people that stumble across this thread. Kudos.
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