Independent Supplier & Replacement Part Notice
We are an independent parts supplier and are not affiliated with, sponsored by, or endorsed by Watkins, Hot Spring, Caldera, Tiger River, or Solana. These names and their part numbers are used only to identify compatibility.
We offer replacement parts as alternatives to spa-branded parts. When this listing identifies a part as the same original-manufacturer replacement, it is supplied under the component manufacturer’s branding and part number, which may differ from the Watkins or spa-brand label and number. Other compatible alternatives are identified in the individual product listing. Please review the listed specifications, fitment details, and any installation differences before ordering.
Temperature Thermister, aka temp sensor for the Watkins made Solana and Hot Spot hot tubs from 2003 forward. This sensor has a 3/8" bulb and a two wire, four pin JST plug that connects to the circuit board. Its job is to communicate the temperature to the spa control and is an integral part in heating your spa. Normally found mounted in the side wall of your tub either just above the spa pack or in the filter area. May be a small piece of foam zip tied around it to insulate it.
Compatible with the Cedric, Hawk and S-Class systems also known as the 73859, 72469, 76840 and 76091.
A common failure of this part is an inaccurate temperature reading. For example: If your spa water says 115 degrees but when checked with a thermometer its actually 100 degrees then its time to replace this sensor.
| Sensor Application | Spa Control |
| Sensor Type | Temperature |
| Application | Watkins / Caldera |
| Model | 4 Pin Plug |
| Connector Type | 4 pin |
| Sensor Diameter | 3/8" |
| Wire Count | 2 wire |
