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turbo

Hi Guys , just got myself a Nest Gen3 thermostat, but am a bit bewildered with these connections on my boiler.
Its a Vaillant Eco Tec plus 837 with theVRC 470f controller. IMG_5242.jpg
Any help would be appreciated , I am a electrician but not on boilers.
 
Sorry to say unless your gas safe you can't get access to the pcb as its breaking the law ;)
 
Hi turbo, frustrating as it is, it is all to do with casings forming a safe seal when removed and replaced.
 
If you have a vr70, why go for nest? They will fight each other :96:
 
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