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This is pretty basic, but in case you haven't already done it - I would turn main power off and unplug from power - with it unplugged, turn on main power and turn back off. Then plug it back in and turn on main power. Wait a minute or so and then turn on sub power. When you do this, do you get any error?
When you removed and replaced the transfer separation unit, did you replace the part, or did you just put the same part back in?
I agree... why else would I?
My question is the same. Did you replace the transfer separation unit with a new transfer separation unit or with the same transfer separation unit?