Hi  this is my first post so please be patient.My problem is the  lack of dhw,i have a  Baxi 105e instant combi boiler.Last week i fitted a new limescale remover to the incoming water pipe,i also fitted a new inline filter onto the filling loop and while the system was drained put conditioner into the c/h system . After checking every thing i filled the system via the filling loop and every thing seem to be ok and the boiler started as it should,c/h worked fine but on opening the hot water tap either luke warm water or cold ran out.Today 31/10/2010 i fitted a new diaphram and things were a little better but still no constant hot water.I tried  turning the d/h/w pre heat off as recomended by a plumber  but the system kept switching between c/h and d/h/w about every 2-3 seconds but stopped if i put the pre-heat on slightly.Prior to draining the system last week everthing worked fine,pressure is about 1.8 bar,is there anything else to check or adjust.Any info would be greatly appreciated.Thanks

The lime scale inhibiter is a Salamander Sesi Electrolytic Scale Inhibitor which is fitted down stairs on the incoming water supply to treat tthe whole house and coupled using compression joints,i don't have anything to bridge the gap if i remove it but i am going to check the filter in the boiler first.The pressure within the boiler stays constant.Thanks.

I checked the filter prior to fitting and the filter in the boiler today ,both seem ok.I have good flow and pressure to all taps and to the boiler,by the way the combi is a Baxi 105e instant,i don't know if it makes any difference.