Sta Rite Pool & Spa - Page 2 - Recent Questions, Troubleshooting & Support

replace the mechanical shaft seal. check impeller and diffuser for damage . prime pump after any repair

How old is the heater? When was the last time it worked correctly? Does the pool reach the set point? If not, how close does it get?How long will the heater run (hours)? What model pump are you using?

Sears runs a resource called Parts;sDirect, you can get parts for appliances, tools, lawn equipment,etc.
Need the model and serial #, it'll have exploded views of the different subsections. All.parts on the exploded views are numbered & correspond to a catalog page alongside the picture, with the cost
posted. I've used it repeatedly, very accurate, prices are competitive.

That unit has specific instructions for water temp operation at 60 or lower. The display also can show diagnostic info and there are indicator lights for diagnostics. Do you have any of those showing any errors? If the temp is jumping from 91 to 104 instantly and then back down to 91 instantly, this is a wiring issue or a bad thermistor. Check the wiring and use an OHM meter to check the thermistor, it should have a chart that shows a resistance at a certain temp. There is a limit switch right next to the thermistor, Make sure it is not shorting out with that.