I have the above boiler but its not working on the heating side.water works fine.there is no fault code on the display.have checked my rc room stat and thats working fine but the boiler wont fire on heating.if i turn the dial all the way past heating the boiler fires but dispays CO and runs to a really high temp 92 deg then shuts off and wont start again.pressure is 1.5 and ok green light is on.
