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Safety First This test involves live high-voltage electricity (240V). If you are not comfortable working with live power, please contact a licensed technician. Always wear rubber-souled shoes and ensure the area around the spa is dry. Step 1: The "Call for Heat" Test Before testing the heater, you must ensure the spa is actually trying to heat. Increase the temperature on your control panel to its maximum setting. Listen for a distinct "Click" from the control box. This is the relay engaging. L …