my ravenheat CSI 85 combi boiler is tripping out when it is in the heating mode it's ok when it's just on hot water only, when in heating mode if i run the hot tap then turn the tap off the boiler then stays on and the heating gets hot. the plunger on the diverter valve activates for the hot water but not for the heating can anyone help please

steve, December 2009

had same fault turned out to be fan pcb

ted, January 2010

I have exactly the same problem as Steve. I have the CSI 85AT that does not have a pilot light so its not the pilot nozzel blockage faults found on the CSI 85T. Does anybody know what the fault is that causes the boiler to go through its start up cycle, but keeps failing to ignight for more than a few seconds in C/H mode. But works fine for drawing hot water. Once the hot water has run for a minute or two, the boiler then works fine on central heating mode?
Help, thanks Neil

Thanks Neil

Neil, January 2010

Check your gas pressure?

Steg, December 2009