Tado wiring with Worchester Greenstar Heatslave 18/25

[guru86]

Before doing that, maybe check the flow and return valves are open underneath the boiler

Thanks, i will try that. Is that just checking if hot?

 

[stem]

In your first photo, there appear to be two wires in Tado N, now there is only one....Or are my eyes deceiving me?

If there is one wire missing, I'm wondering if you have lost the N to the boiler

 

[CountryFan]

Thanks, i will try that. Is that just checking if hot?

You can check that, but if they're closed then no heat will circulate around the radiators

 

[ericmark]

I would expect tado to follow same wiring diagram and one channel uses 1 and 3 not 1 and 4 have you checked?

 

[stem]

A Tado in potential free setting use terminals 1 and 4 so is different from a Drayton Wiser.

Also, this is how it was wired originally when the OP says it worked.

 

[guru86]

Thanks both, the only way seemed to get some improvement was swapping the blue to channel 4 and the yellow bit to 2. But boiler heats up then but nothing to radiators.

Will check if valves open as suggested