ok ....fan reqs 240v ...if stiff lubeing the bearings can help
no permanent pilot .... thermistor can play up....
pcb occasionally has relay sticking ..new pcb solves that ....
if pump on and clock on chk 240v at live into chb ..chk 240v at fan also
the air press switch can stick as well.....all the above mean going into the boiler and poss testing when electrically live ....unless you are totally happy testing and chking when live it is best to leave to an RGI ....
no permanent pilot .... thermistor can play up....
pcb occasionally has relay sticking ..new pcb solves that ....
if pump on and clock on chk 240v at live into chb ..chk 240v at fan also
the air press switch can stick as well.....all the above mean going into the boiler and poss testing when electrically live ....unless you are totally happy testing and chking when live it is best to leave to an RGI ....