Hi Larry I know you may have solved this but on my machine Morn 1390 with Ruida 644xs the IF Protection is the door switch not the water flow and if its red box then its bad. ya may have had a bad connection to the switch but on mine it gave me trouble as its a magnetic switch and I found that it was misaligned with the magnet in the lid. you can test it by opening and closing the lid and watch the red light go on and off. If it is connected to the flow switch you can see what comes up when you stop the flow probably one of the water prot1 or 2. also check out PDF https://variometrum.hu/pdf/rdc6442g.pdf shows pg 21 for the flow switch the standard wiring for these controllers.
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