OHH error code will not clear on a 480 MAAX spa

[RJM]

Hello All,

I have a Model 480 MAAX spa that has a OHH error code that will not clear. We noticed this code about 3 days ago. The temp of the water now is well below 108 degrees that causes this error code. I have reset the breaker to the spa at least 3 times. I opened up the control panel and where the sensors attached to the control panel metered both and found similar resistance levels on both sensors. Does anyone know what resistance these sensors should be ? This error has the spa completely locked out. So I can not check water flow issues or anything else until I get this cleared.

Is there anything you can suggest for me to meter or investigate ? 

[Spa Board Doctor]

Power off.  Turn DIP switch A1 on (test mode on).  Turn power on and wait until you see "Pr" or prime mode on the display.  Power off.  Turn DIP switch A1 off.  Turn power back on to see if the error cleared.  If you still have "OHH" on the display, there is a problem on the board that is repairable.