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Repairing Hot Tubs
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CAUTION: Electrical repairs can be dangerous, especially around water. We recommend that repairs be referred to a qualified electrician or spa technician. Regardless of who performs the work, make certain that all electrical power to the hot tub or spa is disconnected prior to making any inspections or repairs. The information  provided here is for educational purposes only.

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Spa repairs Excessive heat.

Components associated:

  • Thermostat
  • Heater Contactor/Relay
  • Spa Side Control

A) If using a spa side control, disconnect it and attempt to run the unit with thermostat on the control box, if so equipped. If this works correctly, replace the spa side control.

B) Turn thermostat fully counter-clockwise (CCW) to see if heat disengages. If not, disconnect either connection to thermostat. If heat shuts down, replace thermostat. If heat still does not disengage, disconnect coil connections from heater contactor. If this causes heat to disengage, this indicates there is an internal wiring issue. If not replace contactor (stuck contacts).

C) If heat disengages with thermostat fully CCW, but unit continues to overheat if turned CW, check thermostat bulb for proper placement in thermowell. If location of bulb is correct check, capillary and bulb for crimps, kinks or breaks. Replace as necessary. If temp is uncontrollable, capillary is not damaged and flow past bulb location is correct, replace thermostat (unit calibration or sensing ability has failed).


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