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how to fix f7 onheatline condesing boiler ?

i have a customer with a f7 code showing the fan runs at high speed no matter if the boiler controls are off can you tell me what part is at fault the fault reads no fan signal
steve carter, January 2011
to fix the f7 code just simply replace the fan

STEVE CARTER, January 2011
link Click here to see other fixes for Oneline Heatline condensing boiler.