TL:DR Questions
- Why is my tub showing the high limit error if my high-limit sensor is giving the same reading as the tub temp sensor (94F)?
- What position should the tube that holds the high-limit sensor supposed to be in?
The tub is a Sundance Palermo (780 series) from around 2006. It's showing the "- - -" error code. In the manual this is suggested to be the high limit sensor. I can confirm that the water is not too hot. (Family members were in the tub when it switched). The tub's thermometer suggested it was around 93F (it generally reads a bit cold and we have small kids so is normal).
On this tub the high limit sensor is stuffed into the end of a tube. I'm not certain where this tube is supposed to be or what it's requirements are (this is not covered in the user manual). The lead coming out of the control box is not very long (24"). The tube is long enough that needs to coil or snake around to be within that distance of the control box.
My first thought was to buy a new sensor, but I"m not sure that's necessary. I put a meter on the sensor and got a reading that was essentially the same as the hot tub's temperature sensor (both were in the ballpark of 23.41 on the meter, which is auto-ranging and I forgot to look at the scale. The water was around 84F and I assume this maps to ~23000 ohms).
For fun, I unplugged the sensors which are on the same connector and the error codes changed to SN1, SN2 (I assume this means sensor1, sensor2 for both the temp and high-limit), which seems reasonable. That would be a reason to replace the sensors.
A bit of background that seems irrelevant but for completeness: my darling children last week managed to get "water bomb" (think water balloon but thicker and reusable) past the filter and caused flow to be reduced and trigger a pump error. Removed the pump, cleared the blockage and re-installed and now everything was fine. This "- - -" error is happening 48 hours later.
