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I have a 4009 NAC extender. The trouble notification is on on the main panel with the description ''NAC panel open ckt'' Inside the 4009 the led's indicate an open circuit trouble and the 4th led (the ones in a straight line) is flashing. This apparently indicates a trouble with NAC 4, but I don't know exactly what that is. What causes an open circuit trouble in the system. It seems that we saw this same indication a few years ago and Simplex service installed new back-up batteries. I see that there is a different led indication for low/dead batteries but is this open circuit trouble related? Please advise

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