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Mend Micron 50ff Boiler Thermostat Pcb

Micron 50ff will not fire every time?

I have a micron 50ff boiler works fine then it does't fire it's the original P.C.B. no burner or reset light comes on
any ideas please but if I turn thermostat knob a time or two it comes on

Norm
January 2010

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