boiler probs?

[dotto]

Hi guys. A friend has a prob with ( i think) his boiler. Open vented system, two two port valves. When calling for CH or HW, the boiler does not fire up. The boiler is a Potterton Prima F. The valves are opening when calling for CH or HW, the contact with micro switch is made and voltage is sent to boiler ( i checked in wire box) and boiler is getting the voltage too since i checked with multimeter. Does the prob lays within the boiler? Probably the thermistor??? or..? Btw, the pump runs. Thank u 4 your time.

 

[corgiman]

no thermister on this appliance just a phial and bellows stat and a phial over heat stat

the fan is probably buggggered

can u hear it

 

[urbanspaceman]

pcb on boiler

 

[dotto]

no thermister on this appliance just a phial and bellows stat and a phial over heat stat

the fan is probably buggggered

can u hear it

No, i could not hear any whirring from the boiler. I will have a proper look tomorrow. Is that something i can do myself or am i not allowed to touch anything in the boiler?