Hi my Hayward swimpure plus keeps saying “cold” on the display and the water is in the 80s. It reads the correct temperature. It just says “cold” on the display and stops producing chlorine. Thoughts on what is going on? I tried replacing the thermistor on the SWG and that didn’t do anything. Maybe try replacing the salt cell? Thoughts?
Salt water generator displaying “COLD” when water is warm
- Thread starter Calgone18
- Start date
reggiehammond
Gold Supporter
- Oct 4, 2020
- 2,253
- Pool Size
- 30000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-60 Plus
How old is the salt cell? For the Aquarite, if the display shows either "HOT or COLD" and you know it is false, then most likely the non-repairable temperature sensor inside the cell went bad. Disconnect the cell, measure the resistance of the temperature sensor (pin 6 against pin 10 on the plug). Or access the wiring connection inside the cell, nip either the red or blue wire and test. Turn on the swcg, push the diagnostic button once to get rid of the possible "COLD" error. Run the diagnostic, the temperature should read 77°F regardless of the actual water temp. If the cell is still good, you can temporarily install a 10kΩ, 1/4 watt resistor across the red and blue wire inside the cell or rig your own temp sensor as shown in the below link. Hope this helps.
T-15 Cell "Hot" Error, Salt Reading Low - SOLVED (dead thermistor)
And more here ... Aqua-rite under-reporting salt level?