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I just installed a new aqua link rs8 pcb and temp sensor. The heat is set at 104,initially it reached 102 at the water,read 104 on the one touch and as it continued would only reach 100.

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Posted on Jan 02, 2017

  • 990 Answers

SOURCE: spa heater will only reach 100 degrees unit should

This is in your temp sensor or in the well that holds it. The temp sensor is easy enough to replace in most heaters. If you have a mineral build up on the well you would need a pro to do this and you need to address the cause of this. This will be the long shot problem and the temp probe is more likley the problem. I could give you instructions but no heater brand or model and no info on in spa or out of spa or style of control. Good luck.

Posted on Dec 03, 2009

  • 44 Answers

SOURCE: the display on the Jandy

If you replace the sensor and get the same code,there is only one option before replacing the board...This only works on a board with one (4 pin ) red connector terminal. If you have two it won't work. On the back of the board, directly behind the "air temp" wire terminals, there is a small black diode with a silver stripe.This is a redundant circuit and isn't necessary. AFTER you turn off the power to the board, you can cut this diode off with some dykes.

Posted on Sep 30, 2010

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UglyPoolGuy
  • 46 Answers

SOURCE: have pentair easy touch controls just installed

If the Easy Touch is reading the correct temperature, but the heater is not - you need to double check the temperature of the pool water with a standard pool thermometer.
Other things to consider:
1) The water is traveling too slowly through the heater. If the water is heating too quickly, then it will shut it off. If it takes a while for this to occur, then this would not be the issue.
2) Thermostat/thermistor is incorrectly reading the temperature of the water prematurely shutting the system down.
Make sure you really are checking the temperature of the water and matching this temperature up with one of the two readings that you are getting. Don't just take the word of the displays on either unit.

Posted on Dec 10, 2010

  • 990 Answers

SOURCE: Have a Jacuzzi self contained

Check your power through the heater. It sounds like your getting 110v to the element instead of 220v.

Posted on Dec 24, 2010

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Just installed new rs8pcb and temp sensor. Set at 104,only reaches 102, why?


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I have an Aqualink system, spa set to 104, it will heat to 94 and stay there, temp sensor is working, took water sensor out of line, plugged line, assumed heater would just keep heating, it did heat a


The heater may be wired just fine. The aqualink uses its water temp sensor to call for heat based on what you've set the thermostat to on the aqualink. However, most heaters have built in thermostats that over-ride the aqualink. Those thermostats come factory defaulted not to go over 94. Check your heaters manual on how to adjust the thermostat on the heater. Your heater should have its thermostats set to 104 and the aqualink will control the actual temp of the water by calling for heat based on what you've set the thermostat on the aqualink for. Hope this helps.

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If the Easy Touch is reading the correct temperature, but the heater is not - you need to double check the temperature of the pool water with a standard pool thermometer.
Other things to consider:
1) The water is traveling too slowly through the heater. If the water is heating too quickly, then it will shut it off. If it takes a while for this to occur, then this would not be the issue.
2) Thermostat/thermistor is incorrectly reading the temperature of the water prematurely shutting the system down.
Make sure you really are checking the temperature of the water and matching this temperature up with one of the two readings that you are getting. Don't just take the word of the displays on either unit.

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if hook up to the firemans switch turn heater all the way to 104 degrees if using 4 pin connector for aqua link to heater set spa temp to 104 and make sure on aqualink spa heat is enabled and 104 degrees

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Could be the temp sensor about 50-60 bucks, the book will say the board about 350-500 bucks. Try the temp sensor first. If it's reading over what the water is then that is probally the problem.

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