siemens rdj10rf wiring to grant vortex pro external combi

25 Oct 2010
Reaction score
United Kingdom
hi. need some help wiring a siemens rdj10rf programmable stat to a grant vortex combi. I'm not quite sure were to connect the common (lx) from the stat or if i need to. I've connected live to live, neutral to neutral, L1 (stat) to C.H terminal 1 (boiler). According to the grant manual i need to link LIVE to H.W terminal 2 in the boiler.
this just leaves LX (common) and L2 (Changeover contact) in the stat.
Hope i'm making sense...
Sponsored Links
the stat often takes the place of a factory fitted link in the boiler and all the stat does is replace this short link (that is constantly closed and so making a circuit) with a longer link that opens on reaching set temp and closes to fire up the boiler (call for heat). use L1 and LX. Best to refer to boiler installation manual or get in touch with their technical department.

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Sponsored Links