My second post here, and hopefully I can get some help (as I did last time, thanks). I am currently getting an OHH message on my Thermospa (a Park Avenue about 10 yrs old). I replaced my heater element last year and it work fine until the end of the winter. Now it is saying OHH. I just replaced both temp sensors, and it seems to be a little worse. Previously it would start up and read a temp that was incorrect (it said 100 at start up). It would try to heat for awhile, and eventually give an OHH (with cold water). Now that I replaced temp sensors, it turns on and immediately gives an OHH. No pumps come on, just a couple of clicks, displays a few numbers (I am assuming voltage and stuff), then goes to OHH.
Any thoughts would be appreciated. Thanks. Paul.