Hi, I had a classic case of a diverter valve problem. No DHW - the plastic arm wasn't engaging the micro switch, but if I made the micro switch with a screwdriver, the CH warmed up, CH was running ok on its own. Replaced the diverter valve, rebuilt the boiler and it worked fine for a couple of days. Now the demand for either CH, or DHW is being recognised, but there is no ignition to the burner. I'm uncomfortable changing the circuit card as its £150+. Anyone got any other suggestions before I make the plunge for a new card? Could I have done something wrong with the diverter valve replacement? I've drained / refilled, bled, refilled, bled some more, fixed leaks and swore lots!

Thanks,

Doug.

Doug, April 2009

Thanks a,

I had a bit of rubbish in the top weep tube!

Once it was out it was obviously the problem, but I was scratching around.

Thanks again,

Doug.

Doug, May 2009

Check pump pressure switch and for blockage in weep tubes fitted to it

a, April 2009