Hi, I am new to the board and also a brand new hot tub owner as well. We just recently bought a house a few months ago and it came with a hot tub. The problem is....... the spa was drained and we refilled it but after we refilled, the temp was set at 104 but never read the correct temp. Meaning, we got in one night and it said 99 and it was very comfortable but the very next night it read 91 and it was so hot we couldn't even sit down in it. Also, i have been hearing my jets kick on and off throughout the night & day(all day) for the past few days. Now the temp is reading 45 and it will not go past that reading although it feels about 80. Can anyone help me or have any suggestions on how i can eliminate or fix this problem? My husband or I neither have any experience with spas.

Sounds like you have a thermostat issue. The fluctuation in temp reading keeps turning the heat on and off.