Pool and Spa
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There was no picture uploaded. Can you tell me what the error code reads?
That is watchdog... This is an error code that can indicate a few different things, but mostly it means that the temp sensor and high limit sensor are out of sync. I would replace both the sensors first before trying any other things as that is the most common issue. It could be a bad pump or bad circuit board but try the sensors first.
OK well then you need to check the pump that supplies water to the heater as you may have an air lock or a bad pump, if there is no water flowing then the water in the heater housing can overheat and cause a imbalance with the sensors.
Also check the pressure switch on the heater housing and see if you jump across the two wires on top of the pressure switch to see if it will reset topside.
Well try the pressure switch and we will go from there.
All spas have either a pressure or a flow switch on or near the heater housing, it is designed to detect flow of water. The pressure switch will look something like this...https://www.acepools.com/products/tecmark-4037p-universal-spa-pressure-switch?utm_medium=cpc&utm_source=googlepla&variant=1203025159&gclid=CjwKEAiA9s_BBRCL3ZKWsfblgS8SJACbST7DCgsF_PyM8mdTJYJ31Sl_9eUt_h3KX2V3mgslB4xUkhoCAHrw_wcB
Can you take a couple of pictures of the heater area and control box and post them here so I can see the area?
ok sounds good
OK so you have the two black sensors. I would power down the spa, un-plug the sensors and check the copper pins that are on the board, if one is bent or broken you will not get a reading. Be sure that the sensors are tight down on the heater housing. I have seen these sensors be bad from the beginning. Lastly would mean that the circuit board is not registering the sensors and the board could be bad. I would try another set of sensors first though.