ive been having problems with my combi for about 2 years now but now ive no central heating at all and the flame will only stay lit for 20 seconds at the most when i turn the tap on,after which it goes out and the bottom red light comes on.ive tried raising the water pressure, which worked for a while but now even thats stopped working.it seems to cut out when it exceeds 50 degrees and to top it all off its leaking water from one of the nuts underneath the boiler.ive had the washer replaced three times but its failed to stop it.can anyone help me identify what may need replacing as im a girl and dont want to be taken for a ride by the plumber when i get it serviced? thanks
