I have a 1999 Tiger River Bengal model, it uses the IQ2000 control , a watkins 6000 "no-fault" heater. I am using it with 220v service, there are 2 GFCI breakers, a 220v one that only operates the heater, and a 110v one that does the pumps and control. I had it hooked up and working for over a year so I am confident that all of the electrical connection are correct and working. After a recent drain and refill, I activated the breakers, allowing the circ pump to run for a while to purge air before turning the heater on. After a while I turned on the heater, and confirmed it was working fy feeling for warmth under the bottom of the two stainless tubes. I checked the LEDs on the control, and the "limit ok " and "power on" are on. So I walk away and expect to come back in a few hours to a warm tub, but instead at some point everything shuts off and the power light starts blinking. The manual says this is due to the heater high limit thermostat tripping. I have tested the heater with the 3 wires disconnected from the control board. I get 14.6 ohms between the black and white wire, and I have an open reading between the green and white, and green and black. Online information tells me that the heater is supposed to have a reset button but this one does not. I even removed it and inspected it all over and there is no reset button. Is there a test I can run on the two thermostat sensor things that plug into the heater ? What else can I do to solve this issue ?
thanks in advance-