Pool and Spa
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This is very puzzling? As for the ICE code that is normal, when you first turn on the hot tub and the current water temp in the spa is at or below 40 degrees you will see ICE on the topside once water temp rises above 40 degrees you will see cool displayed this will stay there until the water temp rises to within 20 degrees of the set temperature. The Fl1 FLASHING is almost always a flow issue either with the filters being dirty or clogged or the pump not having water flowing through it or enough water to allow flow switch to close.
OK well if all else is checking out great then you have a bad circuit board. Check the pins on the circuit board where the flow switch plugs in I have seen the tiny copper pins bend and that will cause FL1. Otherwise replace board.