Search results

Aye have put the old one back on, but now noticed that the HW is always hot when the CH is on!!? pipe tracing shows the boiler has just a in and out water feed, which then in turn feeds the CH and HW at a Tee and both systems have pumps. I dont think the SM2 HW timer or ON switch actually do...

Aye both wiring should be the same, N and L 1 = HW off 2 = CH off 3 = HW on 4 = CH on Changing it cause the SM2 is sooooooo noisy and annoying, plus with a baby we rather to have the ability to turn the CH on for a 3rd time in a single day. When I swapped it before the LP241 worked right away...

Hi all, got a noob question, we cannot get a engineer out for weeks to do this job, so having replaced programmers before i thought i would replace our noisy SM2 with a LP241, knowing that the plates are identical... thought this would be simple... however! The SM2 is currently wire up as...