✴️【Function】Temp/Hi Limit Sensor serves as a safety device, monitoring and regulating the temperature of our spas. Once overheating spa issues occur, it shuts off the heater. Therefore, if you are experiencing any spa temperature issue, don’t wait to get this Temp/Hi Limit Sensor to resolve it. Very sure this sensor will effectively prevent water from becoming too hot and better improve your spa experience. ✴️【Signs】When you have spa trouble codes as follows: Sn, SnA, Sn1, Sn2. Sn3, HL, EO, E2, E3, Prh, Prr, very likely there is something wrong with your sensor. Check it ✴️【Fitment】Will compatible with Balboa systems that uses this type of sensor. Also deemed as a good option for Cal Spas ELE09900310 (30337), 59-138-1060 (30337), for Cal Spas ELE09900290 (30298), 5-60-8001 (30337), 5-60-8002 (30298), 5-60-8005 (30294), for Cal Spas ELE09900300 (30294), 34-30337, 34-30337-K and for Cal Spas with S/N 05S-15140 and Model 05-V400M-18, 30327, 34-0202D-K ✴️【Installation】1) Insert the 3/8” Temperature Sensor into mount and then tighten the nut；2）Slide the 1/4” Hi-Limit Sensor under the sensor cover attached to the heater and tighten the wing-nut to secure. 3）Insert the 4-Pin Connector into the PCB. ✴️【Friendly Service】 A f-u-l-l refund is available within 30 days if you are not satisfied; we also offer a 12-month warranty from the date of purchase to make sure that you have good experience. Hot Tub Sensor Temp and Hi-Limit Sensor Replace for Balboa systems 30337 30298 30294 25-175-0337 Assembly