my c/h is working fine but when the hot water is run it is only luke warm then it goes cold this is because the boiler fires up for 10 seconds then goes out for 30 seconds then fires up again .the only way to get some hot water is to run the hot tap in the bath and the cold tap in the sink on full.ihave replaced the complete diverter valve,pcb board,and the thermostat sensor but still no hot water

tim, February 2009

thanx mate just as you say it was completly blocked,i have replaced it and it is working great thanx again

tim, February 2009

hi tim sounds like your plate heat exchanger is blocked you can either replace or try to clean it out

tim, February 2009