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micron 50ff?

According to the Instruction for Use, when LED1 flashes slowly and simultaneously LED2 flashes quickly the condition is "Lighting Sequence - Fan/APS."
Does this mean the APS needs replacing? or if its the lighting sequence how is this cured?
The pcb and thermistor have already been replaced and make no difference to the fault. Any advice please, it's cold!!
Ted, December 2011
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