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I have been trying to solve a watchdog error on my Sundance Chelsea 780 series spa. The last time it happened following start up I noticed that the flow valve was extremely hot (150 f). Determined with a digital heat sensor (gun). The water was only 96 f. I'm assuming that the temp of the flow valve is what caused the watchdog error. Your thoughts on this would be greatly appreciated. ****Started up today and everything seemed normal (this has been the case). Ran through start up without a problem; responded to changing temp. setting and the heater going on and off. Circ. pump was running and flow valve was open. All temp checks appeared normal. !0-15 minutes later there was a --- error and smoke was coming from behind the control panel (heater). The temp of the flow valve was now 150 f******