Solar sensor open

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
11,821
Northern NJ
Manual is here —> https://customsolarandleisure.com/wp-content/uploads/2017/05/Solartouch_Manual.pdf

See page 22 & 24.

Solar systems use 10K Ohm thermistor sensors. When the solar sensor is disconnected from the SolarTouch® Controller system, the sensor will read 10K Ohm at 77° F (25° C). Refer to the following table for the resistance at other temperatures. An accurate reading should give a temperature setting that is accurate to ±0.2° C from 0 to 70° C.

You can test the sensor using a multimeter.
 

chris_r11

Member
Sep 17, 2010
19
Campbell, CA
Hi, I could be totally off here, but in my Jandy system with that exact error message, it was the sun sensor that was out on the roof, not any of the water temp sensors.
 

Bama Rambler

Mod Squad
TFP Expert
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Jun 22, 2009
23,702
SouthWest Alabama
What I'm proposing is very simple. It doesn't even require that you know where the sensors are located. At the top right of the board in the controller the 3-pole connector for the solar and water sensors, just swap the right and left most wires. If the error swaps from solar sensor to water sensor, you have a bad sensor or lead wire. If the error stays the same (bad solar sensor) the error is at the board.
 

Harris4521

Member
Oct 16, 2019
8
Central Florida
I swapped them and nothing so I put them back and now the solar sensor is showing open instead of the water sensor. Are they the same sensor. If I replace the solar sensor the wires are a braided wire but everything thing I have been seeing is that the air,water and solar take the same sensor.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
11,821
Northern NJ
I swapped them and nothing so I put them back and now the solar sensor is showing open instead of the water sensor. Are they the same sensor. If I replace the solar sensor the wires are a braided wire but everything thing I have been seeing is that the air,water and solar take the same sensor.
I would carefully check the way you put the sensor wires into the board terminal and that they make a good connection .

Did you test each sensor with a multimeter as described in post #8?

This is not caused by a programming problem.
 
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setsailsoon

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TFP Guide
Oct 25, 2015
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Stuart/FL
Harris,

As Allen pointed out most of these sensors are simply 10K thermistor's mounted in a plastic or metal housing. They seem to fail more frequently than the underlying component that's inside the housing. They typically fail with slight temp rise that accelerates then they read open circuit. You can get them from many sources including Amazon and Ebay with wide variety of price for what appears to be identical parts. I've found the reliability to be variable and not really related to price except that Hayward branded seem to last longer.

Chris
 
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Bama Rambler

Mod Squad
TFP Expert
Bronze Supporter
LifeTime Supporter
Jun 22, 2009
23,702
SouthWest Alabama
I swapped them and nothing so I put them back and now the solar sensor is showing open instead of the water sensor. Are they the same sensor. If I replace the solar sensor the wires are a braided wire but everything thing I have been seeing is that the air,water and solar take the same sensor.
When you swapped them did the error swap from one to the other?
If it did, then there's a problem with either the sensor or the cable going to the sensor.