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If the heater turns on even when on air only, either your relay on the main relay control board is stuck, or the heating element is grounded out. You'll need to unplug the dryer and disconnect the 2 wires going to the heating element below the drum. Test continuity/resistance between one of the terminals coming from the heating element itself to the outer case of the element. If you have any continuity/resistance, then you need to replace the heating element. If you do not have continuity, you need to replace the main relay control board which is mounted to the left side wall of the dryer just below the top panel of the dryer.
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