Replacing Potterton PRT2 thermostat with Siemens RDH100

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2 Oct 2025
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Hi all,

I want to swap my old PRT2 with a newer digital thermostat, I'm just not 100% on the wiring. It looks to me like RED into LX and YELLOW into L1, then BLUE can be safely terminated as it's not needed?

Would be really grateful if someone can confirm whether this sounds correct, I've attached pictures of both below.

OLD:
old.jpg


NEW:
new.jpg


Many thanks
 

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