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Has my builder ruined my boiler?

View the thread, titled "Has my builder ruined my boiler?" which is posted in Boiler Advice Forum on UK Plumbers Forums.

If the cold water feed to the filler loop is boiler side of the new valves you should be able to pressurise the system. It's unclear what's where from the pictures. It needs a sketch of the pipework with valve positions. If you turn a tap into you get hot water? Too much guesswork without a diagram.
 
If the cold water feed to the filler loop is boiler side of the new valves you should be able to pressurise the system. It's unclear what's where from the pictures. It needs a sketch of the pipework with valve positions. If you turn a tap into you get hot water? Too much guesswork without a diagram.

The manual for the boiler clearly says the the diverter valve needs to be open to fill.
 
Get someone out to check it?

No point any of us guessing as by the sounds of it you shouldn’t be touching it anyway.

Regardless looking at your pictures you don’t have a bypass for when both zones are closed. Who knows if you’ve got a non return anywhere on the system.

You’ve also got a combi so hot water demand isn’t with the zone valve.

You’ll need a professional to diagnose on site it in my opinion.
 

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windle poones,
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Karl Murray,
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