What SHORTED H2O SENSOR means
The water temperature sensor, its wiring or connection has failed (shorted or open).
Also shown as: OPEN WATER SENSOR, depending on the model.
Likely causes
- Sensor or wiring fault
Safe first checks
- Note the message and call a qualified tech.
When to stop
Sensor work is inside the heater cabinet.
Parts that may help
Only order a part once the checks above point to it, and match the part number to your model.
Checked against: Jandy JXi gas-fired pool and spa heater installation and operation manual (H0574300). Codes can differ by model and year, so confirm with your owner's manual.
