In terms of efficacy, there can be three types of interactions between medications: additive, synergistic, and antagonistic. 1  Additive interaction means the effect of two chemicals is equal to the sum of the effect of the two chemicals taken separately. This is usually due to the two chemicals acting on the body via same or similar mechanism. Examples are aspirin and motrin, alcohol and depressant, tranquilizer and painkiller.
Save. clean kitchen image by easaab from Fotolia.com. A refrigerator thermostat has only one function -- controlling the refrigerator's cooling system by turning it on or off to ensure that the temperature inside the fridge stays in the correct range of 33 to 40 degrees Fahrenheit.In frost-free models, a separate thermostat with a timer controls the defrosting cycle.ave. clean kitchen image by easaab from Fotolia.com. A refrigerator thermostat has only one function -- controlling the refrigerator's cooling system by turning it on or off to ensure that the temperature inside the fridge stays in the correct range of 33 to 40 degrees Fahrenheit.
How it Works: Description: The defrost control board determines how often to run the defrost cycle. If the board fails, the refrigerator will not go into the defrost cycle. Before replacing the defrost control board, first test the defrost heater and defrost thermostat.If the defrost heater and defrost thermostat are working properly, the defrost control board is likely defective.Control board with bracket.he part(s) or condition(s) listed below for the symptom Refrigerator not defrosting are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page. On the right, view any available part testing videos for each item. 1  How It Works.