Test the mating spade connectors (while connected) between the stereo power supply and the deck for 12-15 volts DC. If voltage is unstable (fluctuating) or inadequate, replace the power supply. 4. If the power supply and the fuses all test properly in steps 1-3, and the deck does not turn on, replace the deck. A soft reset can sometimes resolve an issue. Try another device to connect to your Spa. Some devices can block connections leaving you unable to connect. Power down any likely interferers. If you're having trouble pairing your phone with the speaker, it could be because the speaker is trying to activate its usual connection. Open sensor (heater is disabled) or shorted sensor (spa is deactivated). The display will alternate between "SN--1", scrolling message "HI-LIMIT SENSOR ERROR" and the current water temperature. To resolve this error, please contact Spa World™ Service. What does "SN--2" error message on a Jacuzzi ® J-300™ Collection Control Panel mean? .

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