Jandy AquaLink RS / iAquaLink WiFi-Enabled Pool & Spa Automation Controller with Mobile App Control SENSOR OPEN Error Fix: Temperature Sensor Circuit Open

Error code SENSOR OPEN on the Jandy AquaLink RS / iAquaLink WiFi-Enabled Pool & Spa Automation Controller with Mobile App Control means: Temperature Sensor Circuit Open. The pool or spa water temperature sensor is disconnected or the wire is broken — the controller cannot read water temperature which prevents the heater from operating in automatic mode; the sensor is a thermistor (temperature-dependent resistor) typically installed in a sensor well on the pool plumbing; check the sensor wire connections at the AquaLink controller panel; test sensor resistance with a multimeter (should read approximately 10K ohms at 77°F/25°C); if the resistance is infinite (open circuit), the sensor or wire needs replacement; also check for water in the conduit that may have corroded the wire

The most successful fix is "Test and Replace Temperature Sensor Thermistor" (medium difficulty, ~45 minutes). Estimated DIY cost: $15-$25. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Test and Replace Temperature Sensor Thermistor") is rated medium difficulty and takes about 45 minutes. Tools needed: Multimeter, Flathead screwdriver, Adjustable wrench.

DIY cost: $15-$25. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

The Jandy AquaLink RS / iAquaLink WiFi-Enabled Pool & Spa Automation Controller with Mobile App Control has 8 other known error codes, including: CHECK SYSTEM (General System Fault), COMM ERR (Communication Error — RS-485 Bus Failure), FREEZE PROT (Freeze Protection Mode Active), HEATER COOL (Heater Cooldown Cycle Active), HIGH CURRENT (High Current Draw on Monitored Circuit), and 3 more.