hyperman Posted June 14, 2023 Report Share Posted June 14, 2023 We just moved into a house a few months ago. Been using the hot tub but then found out the water had not been changed in a year. No issues up to this point. Drained the spa and filled it up from our well. Water at 54 degrees. The circulating pump is running and the jets work fine but the heater will not start up. The green light on the side is flashing and the power and ready lights on the LCD are flashing. I have tried to power it off twice as it indicates it could be the heater high limit thermostat has tripped. I have drained some water and I am adding some hot water to try and bring the water temp up some. Trouble shooting also indicates a clogged filter. Filters are basically brand new. I am concerned that maybe some sediment from the well might have got into the system and it thinks the filter s are clogged. I also see it could be air lock? How do I resolve that issue if it is air lock? Any suggestions before I get ripped off and call the service people? Quote Link to comment Share on other sites More sharing options...
cranbiz Posted June 14, 2023 Report Share Posted June 14, 2023 Air lock is easy. At the pump, crack the coupling and keep it cracked open until water flows freely. Quote Link to comment Share on other sites More sharing options...
ratchett Posted June 16, 2023 Report Share Posted June 16, 2023 On 6/14/2023 at 11:07 AM, cranbiz said: Air lock is easy. At the pump, crack the coupling and keep it cracked open until water flows freely. Can modern Hotspring highlife tubs get air locks? Pretty sure there is a recirculation line exiting into the filter compartment specifically designed to eliminate air locks from happening. @hyperman - does the tub display any other error messages besides a blinking green light? You mention high limit thermostat has tripped - do you know how old your hotspring tub is? It sounds to me like your tub is in protection mode - this means the water continues flowing through the tub, but the tub will not turn on the heater because it's in fail-safe mode (the moving water keeps the tub from freezing as fast, but it's not turning on the heater out of safety). I know this can be caused by a failed temperature sensor - if the tub's temperature probe is too far out of range or if it's getting no reading, the tub will go into fail-safe protection mode because it doesn't know if the tub is too hot or too cold. If you're comfortable with a multimeter, you can look up the Watkins temperature resistance chart and measure the resistance of the resistor with the multimeter (turn off spa, unplug temperature sensor probe from control board, measure resistance) - at 54F degrees, you should be around 18,000 ohms resistance, I think if I'm reading this chart correctly: Quote Link to comment Share on other sites More sharing options...
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