Electrician moved Siemens controller and Gloworm boiler's gone haywire!

[Gromit]

Hello all. I was having work done in my house and needed the central heating controller moving to make way for a new cupboard. The electrician moved the controller and also a fuse spur for the Glowrorm Ultracom SXi 2 boiler by only a few feet. Once re-connected the boiler occasionally works ok, but other times it shows S.02 (pre run pump) and other times S.07 (post run pump). The pump runs more or less constantly and the boiler only sometimes produces heat.

I've spoken to Siemens and they say the controlller only has four wires so if it fires up the boiler it couldnt have been done wrong. Electrician says he wired it up exactly as it was before. But I can't believe that this is a coincidence - boiler worked perfectly before, controller and boiler fuse spur is moved a couple of feet with new wire and all goes wrong. What could have caused this? Any ideas very welcome.

 

[rjscan]

does your electrician understand how the boiler works .ie Perm live, swith live etc???

 

[Gromit]

does your electrician understand how the boiler works .ie Perm live, swith live etc???

Thanks Mr Rjscan. Well I would have thought he would know about wiring for a boiler but I do wonder. Siemens who make the controller say that there are only four wires and that the controller couldn't affect the pump overrun. If this is correct could the switch live and permanent live be affected by the rewiring of the fuse spur?

 

[rjscan]

check his wiring
double pole fused spur used to power controller and permanant live on boiler terminals output from controlletr to be connected to switched live on boiler neutrals and earths looped one to the other from spur

Check with multi meter
if this is done correctly, then you have a internal problem with boiler

 

[Gromit]

Thank you very much for these pointers. Very decent of you to help. I've got Gloworm coming tomorrow to take a look because sparks can't do any more. I'll post once Gloworm has been and hope that there is a simple solution.