A
Aragaz
Called out to a Baxi Combi 80e. sorted a few probs, broken mode switch and changed diaphragm on heating side due to sticking up. The hot water side is working fine, heating will fire up for 3 secs and cut out, no flame light comes on. MI's say it's pcb but it's not, i've changed this and fault is still the same. All sensors check out. I am down to blockage in diverter valve or time clock (mechanical built in) being faulty) any clues please?