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PostPosted: Wed Jun 13, 2018 2:46 pm 
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Hi All,Would be great if i could get some help.

Had a new boiler installed worcester 34cdi however didnt have the nest to hand back for plumber to fit so attempted to have a go myself yesterday however it doesnt seem to be working correctly.

I have connected it in the following way (below), the heat link is connected and powered and clicks when i change the temperature however it doesnt actually turn the boiler on ?

connections are in the image and below.

(boiler) Lr - 3 (HL)
(boiler) Ns - N (HL)
(boiler) Ls - L (HL)
(HL) L - 2 (HL)


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PostPosted: Wed Jun 13, 2018 7:29 pm 
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y44snn wrote:
Hi All,Would be great if i could get some help.

Had a new boiler installed worcester 34cdi however didnt have the nest to hand back for plumber to fit so attempted to have a go myself yesterday however it doesnt seem to be working correctly.

I have connected it in the following way (below), the heat link is connected and powered and clicks when i change the temperature however it doesnt actually turn the boiler on ?

connections are in the image and below.

(boiler) Lr - 3 (HL)
(boiler) Ns - N (HL)
(boiler) Ls - L (HL)
(HL) L - 2 (HL)

:welcomeuhm:
To help narrow things down.
Does the boiler work (Fire Up) if you remove the heat link wires from terminals Ls and Lr and refit the bridging link in the boiler.
Also, I assume there are no other timer controls fitted to the boiler.


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PostPosted: Thu Jun 14, 2018 5:39 am 
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Yes the boiler fired up still if I manually set the roads to a higher setting, currently it’s just set to frost as I don’t need it on right now. However when I tested changed the temp to really high to see if the boiler would come on it didn’t.

No other timer controls


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PostPosted: Thu Jun 14, 2018 8:56 am 
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Look for a guy on YouTube called Thomas Nagy. he just uploaded a video on installing a Nest thermostat. He's a qualified sparky and really good.

Edit just found it. I hope it helps.

https://www.youtube.com/watch?v=bqtbYlBU2vE&t=5s


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PostPosted: Thu Jun 14, 2018 7:24 pm 
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Argyll wrote:
Look for a guy on YouTube called Thomas Nagy. he just uploaded a video on installing a Nest thermostat. He's a qualified sparky and really good.

Edit just found it. I hope it helps.

https://www.youtube.com/watch?v=bqtbYlBU2vE&t=5s

Is that the correct link as it refers to the installation of a Hive stat.


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PostPosted: Thu Jun 14, 2018 8:56 pm 
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You've wired it right :salute:

The Heatlink terminals are notoriously bad for getting wires in I usually use ferrules.

If you can use a meter make sure you have 240v on terminal 3 on heatlink and LR on boiler just in case it's a physical issue

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PostPosted: Wed Jun 20, 2018 1:49 pm 
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Thanks for the confirmation, so i have checked all the wires and i think one may have been loose, the double wires into connection 2 on the heatlink.

So i just want the nest to control the radiators, therefore what setting am i supposed to turn the knob to on the boiler? it seems like when i leave it on the lowest setting(frost) the nest doesnt fire up the boiler when i turn the temp above the house temperature on the thermostat, however it does work when the boiler is set at numbe r1 for example?


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PostPosted: Wed Jun 20, 2018 3:59 pm 
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y44snn wrote:
Thanks for the confirmation, so i have checked all the wires and i think one may have been loose, the double wires into connection 2 on the heatlink.

So i just want the nest to control the radiators, therefore what setting am i supposed to turn the knob to on the boiler? it seems like when i leave it on the lowest setting(frost) the nest doesnt fire up the boiler when i turn the temp above the house temperature on the thermostat, however it does work when the boiler is set at numbe r1 for example?

As Razor has suggested the wires can be a little fiddly to wire into the Heatlink terminals. :thumbright:

Assuming you have the WB Greenstar 34Cdi Classic.

If you look at page 7 of the user manual it explains the setting of the central heating flow temperature.
The left hand knob adjusts the CH flow temperature. 5 = 67c or 6 = 75c
Set to 5 or possibly 6 if the outside temperature is very low and let the Nest control the room temperature.
The boiler will then turn on if the Nest calls for heat (room below target temperature) and off when satisfied (room reached target temperature)


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