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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?

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...