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Fitted new relay and still not working. At my wits end now.

So that's one of the relays in the pic? Ok, I've ordered one and will update when it arrives. Thanks for the advice, appreciate it.

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Opened up PCB housing and found this relay that looks burned out, see pic: http://www.imagebam.com/image/cbd49d339424128 Could this be the cause?

I doubt it. Been using current set-up for 2 years and problem has only recently developed.

Right, new flow switch fitted and still no hot water/boiler not firing when hot tap is turned. Removed TMV and checked for scaling, seemed fine. Removed heat exchanger and checked for scaling, seemed fine too. Water pump engages when store hot water is engaged, so don't know what else to...

No, I don't have any LEDs on the front. Gonna get the wife to help me test flow switch today and report back. She can turn the hot tap on while I listen hear if flow switch clicks. EDIT: Just did test, switch does not click or make any noise at all when hot tap is engaged. Tested it a few...

Thanks for the advice. On what part of the flow switch should I use multimeter? On the switch itself or the two wires that go to the pcb?

Okay, have another problem with my oil boiler: central heating works fine but no hot water. Boiler fires when CH is engaged, but doesn't fire when hot tap is turned on. I'm thinking it's likely to be the flow switch, but is there a test I can do to confirm this and isolate the problem?

Right! That's it, 'cos the PRV fitted has no port to connect anything to. So I guess there's nothing I can do except replace the PRV? Now I have a new problem: no hot water. Central heating works fine and boiler fires as normal, but won't fire up when hot water tap is on. I'm thinking it's...

No, checked that already. No diagrams or instructions at all online or in the boiler installation manual, which I have.

Hi, hope this is posted in correct place, my apologies if it's not. I have two boilers plumbed into my central heating system. One is an LPG boiler fitted inside, other is gas-fired grant vortex condensing combi 26 boiler which I have in a brick shed outside. Both can be isolated by valves to...