help need when turning on hot water boiler dus not fire up but wot dus come up is on the self diagnostic digital display is FO .their is 1.5 bar shown on the metre.when heating is on water works fine on hot tap.had new DHW thermistor but has not solved the problem . and now when on timer with heating this has started to do the same it comes up F0 any ideas . many thanks

ray chop, December 2006

You can find the manual for the 80e at
http://www.protherm.eu/component.php?cocode=download&dcid=13

This gives all the codes but I'm sorry to say will not help repair the boiler.

Jim, December 2009

accord 2 manual f0 could be
flow rate sensor= replace
loss if system water= refill system
air lock in boiler =bleed
pump failure =unlikely check though

xhan, January 2007

have you changed the d.h.w flow sensor?

me, December 2006