Broken water temp sensor disables aquapure?

zac280

Silver Supporter
May 29, 2018
53
Central Georgia
My pool is less than 2 years old and I'm getting the pool temp short error in iAqualink. Posts in this forum point to it being a bad water temp sensor, so I ordered two on Amazon for $25. The weird thing is the aquapure display shows 0%, even though it's set for 20%. I know it's not making chlorine and I'm dumping chlorine until the new sensors come in. Is there a logical reason why the software would disable the aquapure if it can't read the water temp? I've seen the suggestion to swap the air and temp sensors, but I'll just wait for the ones to come in. iAqualink gives no indication that aquapure is disabled.
 

PoolGate

Gold Supporter
TFP Guide
Jun 7, 2017
4,873
Damascus, MD
84F. Isn't that the temp from the SWG sensor? I think the one sticking through the pipe is bad. The SWG can also read salt correctly.
I think the way it works is if the main temp sensor isn't working, the Aqualink will not allow the SWG to run. This is the same thing that happens if you turn off the pump and the temp reading goes away (shows "--"). You can switch your air and water temp sensors around to temporarily provide a temp reading.
 

zac280

Silver Supporter
May 29, 2018
53
Central Georgia
I replaced the water temp sensor and everything is back up and running, easy job. You may be right that it doesn't let the SWG run because it thinks the pool pump is off, as on the iAqualink home screen it showed pump off, even though the status could read a pump RPM.

The third party sensor seems to work just as well as the OEM. New has red/white wires instead of red/black. The old sensor reads around 165 ohms, which must be low enough for the software to consider it a short. I did have to cycle auto/service again after starting up the controller, as the first time it came up I got an Aquapure RS485 error and iAqualink wasn't detecting it.

Here's the old vs the new:
water_sensors.jpg
 

BlazeRegulator

In The Industry
May 13, 2011
53
If the AquaLink system isn't getting a water temp reading, it assumes the pump isn't running. If the pump isn't running it won't allow operations like salt water systems and heaters. If you want to run your AquaPure salt system I suggest removing the 4-pin connection to allow it to run separately from the system. Off of its own sensor.
 

PoolGate

Gold Supporter
TFP Guide
Jun 7, 2017
4,873
Damascus, MD
If the AquaLink system isn't getting a water temp reading, it assumes the pump isn't running. If the pump isn't running it won't allow operations like salt water systems and heaters. If you want to run your AquaPure salt system I suggest removing the 4-pin connection to allow it to run separately from the system. Off of its own sensor.
This issue has already been resolved.
 

setsailsoon

Gold Supporter
LifeTime Supporter
TFP Guide
Oct 25, 2015
3,383
Stuart/FL
I think it is a good idea to always keep a spare 10K thermistor on hand.some seemed to last forever and While others last less than a year.not sure why I think it has something to do with the case material and maybe the manufacturing process for the case. Major brands do seem to last longer but they cost about three times as much or more.