279816 Sears Kenmore Electric Dryer High Limit Thermostat Kit. Replaces obsolete 3977393, 3399848. When this thermal limit fails, it usually indicates a venting problem. Check venting inside the dryer and the vent going out of the house for blockages or restrictions. Failure to correct vent issues will cause repetitive thermal cut-out failure. This part is commonly used with heating element part #: 279838. Fits several models. Click MORE DETAILS link for specific model coverage.