Nest v3 Thermostat and Gravity Fed System

5 Dec 2016
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United Kingdom
Hi, can anyone help?

I had a Hive system running my Heating and Hot Water, just been given a Nest and thought I would give it a try. I have an old system which is Gravity Fed and with the Hive I simply held a button down and it went into 'Gravity Mode'. Don't seem to have that with Nest unless I have missed something?

Nest is fitted but doesn't switch my boiler on when the central heating is called but does seem to power up the pump. When Hot Water is called the boiler fires up but as expected the CH does not come on.

I seem to have a very basic system with L, N and HW ON and CH ON only. I have checked various diagrams and jset up as instructed, jumping the N to 2 and 5 on the Nest Heatlink.

Does anybody have any ideas? I'm missing that Hive now.

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