My guess, with the flickering lights, is that your 6+ year old battery is probably the reason for the refrigerator issues as well as for the lighting problems.... Essentially, when you unplug from shore power, the battery is not producing enough voltage/amperage to fully power the ignitor in the refrigerator LP system, causing the "failure to switch to LP operation"....
If your battery is a "hybrid", then be sure to get a "Deep cycle battery" and not a "hybrid start/deep cycle" as a replacement. If the new battery has "CCA" in the description of available amps/power, then it's not a true "deep cycle battery"...
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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