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Mend Micron 60FF Boiler Pcb Thermistor

Micron 60FF flashing Green Led Lights?

My Miicron boilers Led lights flash all the time when turned on, the fan starts but the boiler doesn't fire up at all. I've replaced the PCB but it hasn't changed a thing, might it be a faulty thermistor?
I would appreciate any advise. Many Thanks.

Barry
May 2010

Micron Micron 60FF Heating, Home Heating Systems Boiler Pcb Thermistor

If LH Light lit & RH light not / PCB or GAS Valve Faullt.
LH light not lit & RH Light on / Burner lit
LH light flashing fast & RH light not on / PCB Fault
Both lights lit slow flash, simutaneous / Polarity incorrect
RH light slow flash & LH light fast flash / THermistor Fault
RH Light Fast Flash & LH slow flash / APS swithch fault
Both lights slow flash Alternating / PCBFault, Gas Valve passing, Flame sense probe shorting to earth.
RH light on & LH light slow flash / PCB Fault
RH light on & LH light fast flash/ Ignition Lockout
Flash slow 2 hz
flash fast 8 hz

ECF1878
July 2010

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Micron 60FF Boiler: Green Light Flashing - Help