I have a Coast Spa with a TSPA-1 spa pack. The FL C error (i think its a high pressure switch error) is on. The tub continues to operate except that there is no voltage to the heater, but the display indicator shows the heater icon. I tried to jumper across the pressure switch and it still does the same thing. I also checked the pressure switch without the leads on and there is continuity through it. What else could I check?