2000 HotSpring Jetsetter that sat one and a half years unused. Started it up one month ago and all seemed well. However, discovered that it won't heat to capacity. When set to 104, it only heats to 98-99. Ideas?

Is the green ready light on? If so where are you reading the temp from? Most times I find that people are basing their temperature reading on a $5 duck/turtle thermometer which is usually wrong. Try taking the temp with a medical thermometer. If the temp truly is 98 degrees and the green light is on then you probably need to replace the control thermistor.



If the green light is not on is it flashing or is the power light flashing? If so take the filters out and try resetting the power.

Turn it up higher. You still have UE1, UE2, UE3, and UE4

I'm using a store-bought thermometer, not a duck. I trust the reading because it doesn't feel hot enough when I am in it. Is the control thermistor an item that I could replace myself and where is it located?

To Swine, not sure what ue1, ue2, ue3 ue4 means. 104 is as high as it reads on the digital display. Past that is garbage on the display.

That "garbage" is UE1, UE2, UE3, and UE4. Look closely.

UE1 stands for 105, UE2 106, UE3 106.5, and UE4 107.

Is is against spa "law" (UL listing) to have a "SET" temp higher than 104. The "UE" nomenclature was designed as a loophole...and they got away with it for almost 10 years.