The Warm Zone will not glow red like the other cooking elements.
FOOD POISON HAZARD : Bacteria may grow in food at temperatures below 140 °F.
Always start with hot food. Do not use the warm setting to heat cold food.
Do not use the warm setting for more than 2 hours.
The Warm Zone, located in the back center of the glass surface, will keep hot, cooked food at serving temperature. Use the Warm Zone to keep food warm after it has already been cooked. Attempting to cook uncooked or cold food on the Warm Zone could result in a food-borne illness.
Push the Warm Zone element knob in A.
Turn the knob in either direction to the desired setting B.
The control knob clicks when it is positioned at OFF, HI and LO.

For best results, food on the warmer should be kept in its container or covered with a lid or aluminum foil to maintain food quality.