I tried looking for a search function on the forums, so sorry if it has been asked before. We bought a house a month ago with this hot tub. Worked great for the first month, now we get an OH which says heater is deactivated overheat protection, and a FLO (heater is deactivated, pump may also deactivate, proper flow of water is inhibited or the flow switch has malfunctioned) warning after.
Trying to go through and see if there is anything we can trouble shoot. The manual says check for proper water level, clogged filter or clogged filter. The filter looks clean and the water level is high enough (up to the pillows).
We've had the error for about a week, but our tub is maintaining temperature from day to day (it just won't turn the heater on when we are using it).