This is a somewhat common problem on the lower end Sundance tubs. It could be the topside, PC board or both. Besides the symptoms you have noted, sometimes the display will flash one number at a time, rather than the full temp display. Troubleshooting involves connecting a known good topside to the existing board to see what happens. You should still be under warranty though.
John
Thanks for the reply John.
I was thinking the same direction.
There is a dealer on our island, but he refuses to give any support or even sell us any parts, because we did not buy the spa from him.
So I will have to go on a search for a replacement topside first.
I already found some online, but most were older models.
Maybe you have any suggestions here?
Jos
From what you described it is not the board or the top side I think you have a bad tempsensor is what it sounds like to me and the Capri is not a low end sundance it is in the top of the line series 880. part number 6600-167 temp sensor box end.
Thanks James.
Indeed the Capri is a top line product.
I checked the temperature sensor. The resistance was around 15kOhm.When I warmed it up a bit with my hand, the resistance was going down. So I suppose it is still working correctly?