for the past month the saunier duval f30e semia condens boiler just doesnt stay on it just keeps trying to restart its self some times it stays on but if you run the hot water it kicks in and out we can only get about 1/4 of a bowl of hot water most of the time we dont get any hot water??? we have had 2 heating/plumbers out they are baffuled we have changed the fremister had curcuit board tested done a flush on the heater exchange and the system has got sental x800 flush boiler has been stipped the only thing left to do is the 3 way valve???

sam, March 2011

only one should get hot (the hot water) so it looks like the divertor valve

brian, March 2011

thank u brian ;) i did what you said turned hot tap on with the system cold & out of the five pipes only 2 get hot the others stay cold ??? we can sometimes get the heating to work when we run it from cold same with the hot water but if we run the heating and some one turns the hot tap on & some times when it reaches the temparture that its set at thats when we get the problem of were the flame goes out then trys to kick back in?? is the divertor valve the 3 way valve if so this is what our plumber/heating guy is coming back to clean tomorrow morning but he said the other day that if that doesnt do it he isnt sure what else he could do???

sam, March 2011

it's relatively easy to check divertor valve with the system cold turn on hot tap and feel at heating pipes just below boiler if they get hot then the valve is faulty if not then more info is needed i.e. is heating o k if not when does boiler trip out straight away or after a while ? has the gas pressure been checked? when you say it tries to restart do you mean just the burner or the pump and fan etc.

brian, March 2011