Another Saluspa Heating Failure

[jademann]

I have the Grey Saluspa "egg" with the round green inflatable hot tub. It is about 18 months old, but has only been used in that time for 4 months.

I had some E2 errors early on which I corrected with a new filter however it has recently started to not maintain temperature, it sits there are at 93F when the setpoint is 102F.

I took the impeller apart but found no wear or problems with it. It was noisy but not any longer.

A couple of times I turned it all off for a few days and when I switched it on it went up to 104F with 102F setting.

However next morning it was back to 93F.

I am thinking there must be something simple inside which is not working properly, but I don't know the internals. Any ideas what might be wrong?

 I have been through 3 bucket heaters, but they all fail after a few days. 

[CanadianSpaTech]

Might want to post this in the inflatable section of this forum... https://www.poolspaforum.com/forum/index.php?/forum/28-inflatable-hot-tubs/