Watkins / HotSpring Hi-Limit Sensors

Watkins hi-limit sensors are safety temperature sensors used in Watkins spa control
systems including HotSpring Tiger River Caldera and Solana hot tubs. These sensors
monitor water temperature independently of the primary temperature sensor and
shut down the heater or entire system if unsafe temperatures are detected.

Important clarification: A hi-limit sensor does not cause a hot tub to overheat.
Its purpose is to stop continued overheating. If a spa is overheating the hi-limit
sensor is doing its job and the real cause of overheating must be identified and
corrected.

Common causes of hot tub overheating include excessive filtration or heating
cycles especially during hot ambient weather pumps running too frequently or for
extended periods incorrect pump wiring after a recent pump replacement and heat
being trapped due to heavy insulation during summer months.

Circulation pumps run continuously by design and do not cause overheating.

Control board relay failure can cause overheating but this is rare.

In very hot climates venting the spa cover by breaking the seal on one side can
help release trapped heat although cooling may take several days.

This category includes hi-limit sensors designed specifically for Watkins control
systems. Watkins hi-limit sensors are proprietary and must be matched exactly by
spa model control system generation and part number. These sensors are not
interchangeable with standard aftermarket sensors.

Symptoms of a faulty Watkins hi-limit sensor may include nuisance shutdowns
overheat-related error codes or failure to reset after the spa has cooled.
Corrosion scale buildup sensor drift or moisture intrusion can affect sensor
accuracy.

Before ordering identify the exact HotSpring Tiger River Caldera or Solana spa
model and existing hi-limit sensor part number. Using the incorrect sensor can
result in system errors or improper operation.

If you are unsure which Watkins hi-limit sensor is correct for your spa do not
guess. Text clear photos of the existing sensor control box and wiring connections
and we will help confirm the correct replacement before you order.

Text photos 772 800 5445  
Call 844 500 4645

Note SpaShopper is not affiliated with Watkins Manufacturing HotSpring Tiger River
Caldera Solana or any spa manufacturer. Brand names and part numbers are used for
compatibility and identification purposes only.