Maybe the salon strip heater has a ground fault. If it does and you use a GFCI extension cord, turning on the heater it will trip.
But if it is only coming on when using that plug, maybe that plug has a problem.
For that light to come on, power has to be flowing on the ground wire, and returning by way of the neutral, hence a ground fault exists causing the light to some on. The reverse polarity light is typically a tiny red neon bulb set between ground and neutral wires.
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