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Mend Worcester CDI 40 Boiler F7

boiler not staying on?

My worcester cdi 40 keeps flashing F7. How can I turn on my boiler and stop it keep shutting off

Danny
November 2013
WorcesterWorcester CDI 40Heating, Home Heating SystemsWorcester Boiler F7
igniton control flashes 2 time, flame no call for heat

Steve
November 2013
refer to manual F7 check electrode clean with steel wool
may be carbon on flame detected or dry joints on PCB

ltd
November 2013

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Worcester CDI 40 Boiler F7 Error - Fixes