Grab your voltage indicator and make sure the you haven't accidentally wired the permanent live Into the pump. I've done it before and so has everyone else it's just a silly mistake WE ALL MAKE. I once connected 8 dual zone combo hearings in a day and got a few wrong. No biggy mate. It it's wired right check the room stat or the boiler you might have the wrong sw wire to the boiler.
 
Grab your voltage indicator and make sure the you haven't accidentally wired the permanent live Into the pump. I've done it before and so has everyone else it's just a silly mistake WE ALL MAKE. I once connected 8 dual zone combo hearings in a day and got a few wrong. No biggy mate. It it's wired right check the room stat or the boiler you might have the wrong sw wire to the boiler.

I haven't lol
 
Grab your voltage indicator and make sure the you haven't accidentally wired the permanent live Into the pump. I've done it before and so has everyone else it's just a silly mistake WE ALL MAKE. I once connected 8 dual zone combo hearings in a day and got a few wrong. No biggy mate. It it's wired right check the room stat or the boiler you might have the wrong sw wire to the boiler.

I have made mistakes occasionally, but have always found them when testing the system.

It became a running joke that I couldn't wire a pump properly a few years ago, it turned out Worcester CDi boilers were leaving the factory with the connector plug for the pump fitted backwards. I had connected the pump live and refitted the plug the way I found it, it was only after looking carefully at the diagram in the manual that it became clear the plug was the wrong way round.
 
every 1 makes mistakes, and like you say dave about testing the system to rectify the mistake. I would be embarrassed if the customer had to point it out 2 me like what happened to the OP.
 

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Title
Combi with zone valves!!!
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Central Heating Systems
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Tom W,
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Leesparkykent,
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