I'm sure you know this, but here are the error codes that you're seeing.
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E5 - Open circuit or out of range Freeze Sensor. Air conditioner and dehumidification operation will be locked out. Heat pump, furnace, heat strip and fan operation can continue to operate but displays the last temperature set-point.
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E9 - Invalid zone configuration. The dehumidifier DIP switch and either the heat pump or heat strip DIP switches are set to the ON position in one zone. Heat pump, heat strip, air conditioner, and dehumidify operation will be locked out in the affected zone.
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From the description you gave, I'd say that your thermostat is failing. The FU is probably just a symptom of the failure.
Since it's a new unit, it's under warranty. I'd contact your dealer and let them look at it.