ravenheat csi 85 780 series red light flashing,pump and fan working and nothing happened resetting do not help it is going strait in to this mode I have replace overheat cut off thermostat but not chenge any think please help

Alexandr kulecha, June 2015

''pump & fan working'' but boiler not firing

boiler not completely dead then

assuming the combustion casing is on properly & AIRTIGHT my guess would be the AIR PRESSURE SWTCH not making when fan is running

you could try giving the boiler casing a good hard whack with the palm of hand near the location of the APS [I believe the top right hand rear corner of the boiler]

this might help ''encourage'' the APS to operate normally

if that doesnt work try calling ravenheat technical helpline 0113 252 7007

not my favorite boilers to work on
very difficult to diagnose
very expensive spare parts
very difficult & time consuming to replace parts

I tend to avoid them at all costs

Q, June 2015