Pool and Spa
Questions about Pool Repair? Ask an Expert Online.
Hi there, I'm Cole. I see your asking about spas and I think I can help as I have over 10 years of experience.
If it was me i would tend to think its the thermostat. I would tend to think its a manual dial type theremistat? If it is than i would try and replace that first. If this tub is controlled by a digital topside then let me know. Sometimes you can replace one probe and sometimes they want you to replace both at the same time. (only on digital topside units)
Sounds like you have a control panel up top where you can adjust the temperature?
If so get the model number of the control box underneath i would tend to think its a sensor error. We can try and clean the pins on the sensor if we know where there located, if that does not work we can change out the senors.