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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
Heating, Home Heating SystemsCode Showing Runs
to fix the f7 code just simply replace the fan

STEVE CARTER
January 2011

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Mend Home Heating Systems
Mend Heating, Home Heating Systems
Free repair help for home heating systems