If you have no control over the temperature of your hot tub, here are a few things to look for:
-Ensure the high speed pump is not running for long periods as the friction of the water will raise the temperature.
- Measure the ambient air temperature of the spa cabinet. If you think the temperature is too high, leave the door open to confirm the problem. If the problem goes away when the door is open, use a timer on your spa pack or increase the ventilation of your spa cabinet. If the ambient air temperature is very low, increase the insulation around the equipment. Be careful not to place the insulation too close to the equipment, as this could be a fire hazard.
- Check the pressure switch and make sure the setting isn't too sensitive.
- Make sure the filters and skimmer baskets are clean and not causing a flow problem.
- Check for loose connections on the heater circuits.
- Check the thermostat. Makes sure the probe is all the way in the thermal well and the capillary is not kinked. If all else fails, replace the thermostat.