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Hi I need some help on how to wire up this nightmare... (They're usual sparky had an argument with customer and left job)...Trying to help a mate out, just not done boilers before...

Property has a Greenstar external 18/25.
Hot water and heating running off a Honeywell DT9400C and BDR91...
Has just had underfloor water heating fitted to a Hetta wiring centre...

Pretty much need to know what goes where...been playing about for a while and its really frustrating now 🙄...

Will try post pics of devices.... hopefully someone can tell me where all wires go?
Much appreciated for any help in advance...cheers


Pics are just google images, the pictures i took are too big to upload...cheers.
Urgent boiler and ufh wiring help needed... IMG_20220611_125409 - EletriciansForums.net
 

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