I have an ideal isar he30 combi boiler. My problem is that the central heating is'nt coming on but the hot water is working fine. I have had the system fitted for about 4 years and last year had to fit a new (Orange) upgraded pcb as the boiler was not working at all. This year when i came to use the central heating side of the boiler it just would'nt kick into life apart from randomly a few times in the last week. The boiler receives a signal from my wireless unit telling it to come on but nothing. any advice is appreciated thanks