Hello I have Ariston E-Combi Boiler and red light keeps on coming on, the pressure bar is 1.5 and I have no heating and no central heating,I have unplugged the boiler from the mains for 30 seconds and plug it in again and reset the boiler,I get hot water and heating again,but the problem happen again yesterday 4 times and again today Can you tell me what you think the problem is.