Old-Biscuit thanks for your suggestions. Other non–related projects has delayed me from responding. The LP mode stays consistent with AC mode. At setting # 5, the food section will cool down to 35* to 37* and 0* to 6* in the freezer. After several hours, the unit warms up (the last time it was 40* in the food section and 27* in the freezer) without any changes to the settings. I plugged the refer into an extension cord to verify that the problem was not the outlet. The same thing occurred. I unplugged the heating element and I plugged it into the extension cord and the unit cooled to 21* in the food section and -14 in the freezer. The amp draw was 2.02A at 117.5V AC. All connection have been checked. There are no obstructions to the vents. Where do I go now? I’m not opposed to replacing the circuit board if needed.