aparts

Our tub decided to overheat going to 108 deg. before it shuts off in OH mode. Any ideas where to look I assume the thermostat or the heat sensor but I wont get a chance to look at it until tomorrow. When it overheated I don't think the heat indicator was lit but it was definetly overheating. We never had any problems with this before. we have had flow valve problems but our heat was always okay. The only bad part is that our dealer went out of business soon after we bought the spa.