ferroli boiler?

Is this a 77ff? This boiler sucks air in from outside through the fan. Take the fan out and you will probably find the blades are coated with dust & leaves etc. Clean this off and the fan should run at full speed. If it doesn't fire up then it's probably the air pressure switch
ps. Spray some wd40 on the bearings.

gleach
May 2007

Chances are you have either a faulty air pressure switch or an overheat stat has cut out. Neither are easy to test if you are not familiar with using a multi-meter or to be able to check the combustion chamber seals.
You can test for overheat failure by going through the pilot lighting procedure. If you can put the pilot out and relight it exactly as described by the instructions then the o/heat stat is probably o.k and it is more likely to be the a.p.switch.
If you can't light the pilot the correct way (i.e. no spark for pilot) then its more likely the o/heat stat.
There are other causes but none that you should be trying unless you have the neccessary equipment and knowledge.

T.H.S
April 2007

hi, i have the same problem, mine is a 77 ff combi and the pilot light remains but after a day when you put hot water or heat the fan will come on but the gas won't light up although the pilot light remains.

phil
April 2007

Which model ferrolli? Sounds like quite an old one if it has a two speed fan. Possibly a 76ff or a 77ff or maybe a Hawk. Does it have a permanent pilot light?

T.H.S
April 2007