Welcome to our forum.
LF will come up if the tub sensed a low water or low flow condition 4 times in a row. This usually means that your filters are dirty or your water level is low however, there has been a few sensor issues lately and they are on top of it. Keep an eye on it and if it happens again have them check the sensors.
5 Times on a 24hr period.
As you know, the techs were here on Thurs. I haven't used the tub since. I went out this morning and I had a code of "OHH" Cld the dealer and the tech happened to answer the phone. He had me Turn off the switch and restart it. It went thru all the "PR" stuff, and then "--F" and then the heat light came on (the temp was 81) he said that was good but he'd be here tomorrow. I went to check it just now and I have a new code "dr" .