I am getting an OH code on the start up of my spa (after it runs for about 10 seconds). The model is Leisure Bay Rio Grande with a G2 panel set for 240V.
The water temp is showing a 76 degrees. I set the heater down to 70 degrees and it still happens. I can press a button (up/down) and the unit starts up for around 10 seconds then shuts down with an OH.
Note that the spa is pumping water fine.
I suspect that it is a bad sensor, but it looks like three different sensors come off the board. Two look like heat sensors (one goes to directly to the tub, one goes to the heating unit) and the other one looks like a pressure sensor (attached to the heating unit).
Frankly, I am not sure what the heating sensor is for. But, since it is set to 240V I really don't want to screw up.
Any ideas on how to get this thing back working. BTW, I have had intermittent problems restarting the hot tub after the summer but usually, I can clean the board off with a can of air and it works.