2 port valve only works with cover off!

[msw109]

Recently fitted a new actuator and head unit to a Honeywell 2 port valve on the hot water. When calling for hot water, the valve opens, the pump runs but no boiler. When I take the cover off the valve and call for hot water, it works normally. This was the case on the previous valve that was fitted and is now repeated on the new one. Any suggestions as to the fault? It seems to work fine with cover off, but not when it's on!!!

 

[townfanjon]

Blimey cant wait for the answers on this one lol.

Screw to long ??

 

[msw109]

I left the screw off the new cover and just pushed it on so the elecs are covered!!

 

[jaydebruyne]

Have you tried disconnecting the earth wire from the cover...? Its the only thing I can think of but even that's a stab in the dark.. I'd be extremely interested to know what the reason is if you ever find out...

 

[village idiot]

I was going to suggest an Earth fault/problem as well??

 

[Unregistered]

I have exactly the same problem. I have fitted the cover as loosely as possible without tightening the screws and it will not work. Remove the cover and everything works fine.

It is a complete mystery.

 

[Dotty]

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