Welcome to Backyardplus! In this video, we show you how to troubleshoot the logo light in a 2023-current Hot Spring NXT spa. This logo light has three diagnostic lights, a blue power light, a teal ready light, and a status indicator ring. Under normal operation, your spa logo lights should be solid blue and solid teal.

Solid Blue and Teal Lights

The solid blue power light indicates your spa is properly supplied with power and the solid teal ready light means that your spa water is within 2 degrees of the set temperature. If you increase or decrease the temperature setting of the spa, the ready indicator will turn off until the water temperature reaches the acceptable range for the new temperature setting.

Solid Blue Power and Flashing Yellow Status Indicator Ring

The solid blue power light and flashing yellow status indicator ring can mean a few different things. Most of the time it indicates that there is a flow issue (clogged filters, airlock, bad pressure switch, bad circulation pump) but it can also indicate one of these issues.

ACE Alerts: ACE salt system fault
E4: Peripheral Fault: Cool Zone system fault
E11-16: Cool zone offline: Accessories fault: no ACE, no lights, no music
E2: No Flow Check Filter: Bad pressure switch, clogged filter, airlock, bad circ pump

Flashing Red Power, Ready, and Status lights

When all the logo lights are flashing red, it means that the spa is in high limit trip or protection mode. The LCD screen will display this error message, “Protection Mode.” Disconnect the power for at least thirty seconds to reset the heater high limit. If it will not reset, it could be caused by one of these things:

High limit thermistor plugged in incorrectly
Clogged filter
Airlock
Bad circulation pump
Bad high limit thermistor
Bad heater
Cold water startup (spa water is below 55°F)
Voltage spike or power outage

Solid Blue Power and Flashing Red Status Indicator Ring

When the power light is solid blue, and the status indicator ring is flashing red it indicates that a problem exists with the temperature control sensor (REG THERM) or the Eagle control box. The LCD screen will display 50 degrees on the control panel or this error message,” E5: SENSOR FAULT.” First, test the temperature control thermistor (REG THERM). If the thermistor fails the test, simply replace the thermistor. If the thermistor passes the test, it means the Eagle control box is bad and must be replaced. Here is the thermistor testing procedure:

1. Disconnect power from the spa.
2. Set the meter to 20K on the OHM scale.
3. Record the temperature of the spa water.
4. Unplug the thermistor from the control box.
5. Meter across the two Thermistor leads.
6. Refer to the Temperature versus Resistance chart to find the correct resistance value for the temperature measured. If the temperature and resistance do not match that of the chart, this test has failed, and the sensor must be replaced.

Blue Power light Off and Flashing Yellow Status Indicator Ring

If the blue power light is off and the status indicator ring is flashing yellow, it means that there is no voltage detected going to the heater. The LCD screen will display this error message,” E6: NO HEATER PWR.” Check if the breaker is tripped. If so, reset the breaker. If the breaker is not tripped, there may be a problem with the GFI breaker or the Eagle control box. Call our tech support at 805-541-9000 for assistance.

Logo Light not Working?

If your logo light is not working, make sure it is plugged in. Confirm that the logo light is plugged into the logo light adapter cable and that the cable is plugged into SPA LIGHT on the motherboard.

Watch the video here! “How to Troubleshoot the 79470 Logo Light in all 2023 – Current Highlife NXT Spas”

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