Tutor for Gatsby and Imperial Spa Sensors

WELCOME TO SENSOR TUTOR

Gatsby/Imperial Spas electronic spas use 2 actual sensors and a third sensor more commonly called the pressure switch. Basically the board has to "see" what's happening. It does this through it's sensors.

First, the "Temperature" sensor. This sensor does just what it's name implies. The actual sensor resides several places; in the water through the spa wall or in a dry well. As temperature goes up or down it increases or lowers the resistance in the sensor. The board senses that and sees it as the temperature and reacts accordingly.

The other electronic sensor is the "High Limit" sensor. It too does what it sounds like. It design to tell the board whether the water is getting to HOT and if so, shut the spa down. The sensor mounts on a clip on the back or bottom of the heater housing. It mounts on the heater because that will be the first place for the heat to come from and so it's a protection to avoid either allowing the water to get too hot or even causing a fire.

If you want to test to see if one of these sensors has failed out can. You must have a good digital volt/ohm meter. Set to ohms and compare the resistance of each. They should be very close.

At room temp, the OHM should read 11.7 resistance.

Any more questions, go to: Ask the Expert