I have a Potterton 80E. A couple of days ago it cut out with a re-assuring (not) pop pop noise then cut-out.
At first when I re-started it the fan came on straight away. The boiler would fire up and last for a little while before cutting out.
Now when I start it up the fan doesnt work. Occasionally the boiler fires up but cuts out after about ten mins...
I have had my other half turn it on while I have my hand of the pump - next to the emersion heater - and it turns on/ vibrates when the boiler is turned on..
Any ideas as to the problem - or ways I can eliminate / narrow down he problem?
I know nothing of boilers - I am an unqualified muppet - my advice is potentially dangerous.
When the bolier gets a call for heat the control board supplies power to the fan on two red wires terminals 7 & 8 on the control board. There should be 230V betwen them at this tme.
The fan is monitored by an air pressure switch - the switch must be made for the boiler to light up and remain running. If the fan fails or begins to fail the air pressure switch will signal the control board to shut down.
Your boiler shut down spontaneously. On restart the fan ran but the boiler soon shut down again. Now the fan no longer runs.
Most of the symptoms you report point towards the fan. My simple uneducated analysis is that the fan's bearings are (have) siezed up. Your earlier intermittent running was happening just before they finally gave up.
No warranty expressed or implied in this answer.
Good luck...
Peccavi, March 2010
no fan won't cause it to trip.
you'll need to test a few parts with a multi meter.
hi-spec plumbing & heating (essex), March 2010
Oh - Ive pressed the reset button and its not 'out' if you know what I mean so I do not think it has tripped.
Danny, March 2010
the boiler fan has to run to co ordinate the ignition sequence so if it isnt running the fan needs replacement or the board isnt supplying power to the fan or the power supply to the boiler is failing
