Hi sorry but I am back again, the boiler is a Ideal Classic RS40, I installed it over 25 years ago and it worked fine for a good few years. Things packed up over time IE: room stat, programmer, 3 port valves etc. Recently I had to replace all the electrical inners due to being plastic in a hot area IE: Gas control valve, Piezo unit, Gas control valve, etc. I checked all the wiring to make sure all was "I HOPE IN THE RIGHT PLACE" I also replaced the 3 port valve as the heat was not working. After all this only the water would work, the heating would only work if I pushed the manual lever over. I am only doing all this as at 82 I cant really afford a new boiler. Plus I would need to change the whole kitchen to accommodate it. Any help before I blow my brains out.