Drayton Tempus replace with Nest Heatlink

I will check all wiring again, hope can find out the answer...

Cylinder thermostat is it mean the Nest thermostat?
 
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Do you mean this big guy? Where can i find the Cylinder thermostat? I have no idea of it as i only use combi boiler before.
 
The big guy picture.
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Yes that’s the one, it’s behind the grey box, so unlikely that you’ve lowered it. Did you heat the cylinder up already?
 
I have checked the wire, and seem not problem.
I have use the "testing heating" from Nest thermostat and it is work, the boiler status show "C" and burner light was on.

I am thinking if the heat function okay, the only possible problem of wire shoulg be the one at Nest terminal 6...

And i find that there is no hotwater testing on Nest thermostat, only heating, is it normal?
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The cylinder may heat up because my wife truned on the hot water function with the old programmer this morning for showing, maybe i need to test it again tonight?
 
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Sorry, posts overlapping. Yep, wait for it to cool down and then test and report back.
 
I found the problem finally.
i use this type of connector for connecting some of the wire together, and i have change the connector to a new one, and it's work!

I don't know how to say but just want to let you know i am really thank you for your help.
 
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