Caldera spas hot tub Olympic model blows circuit breaker trying to heat up

Remove all pwoer and then gain access to the heater probe. Read each probe from the center connector treminal to the metal base with an Ohm meter. There should be no reading. If you have low reistance the probe is internally shorted and will need replaced. It is a common failure for a heat probe. If the probe is bad when you do buy a replacement buy the "Coated" element. The extra $15.00 is well worth the investment in the overall lifetime of heating element service.

Replacement elements can be found here

Thanks for using FixYa.

Kelly