These are used where 2 or more compartments are cooled from one evaporator, it gives a degree of temperature control.
The refrigeration system will be used to cool the freezer department and the air from the freezer used to cool other compartments usually with the aid of a circulation fan. When the baffle is signalled to open the fan will blow cold air into the secondary department and warm air rises to be cooled in the primary cavity.
Baffle are electro mechanical and require a signal from a temperature monitoring device and the associated sensors and electronics to provide control, some older units use a bellows type diagram that opens/close the baffles when a temperature is reached.
The electric baffles use a small synchronous motor to move the baffle usually a reed or micro switch is fitted to tell the controller what position the baffle is in.
What can go wrong with these baffles
If the primary unit is working fine and is freezing the cavity as normal then its a sign that the cool air in not getting into the secondary compartment for some reason, it could be a over freezing and a blockage, fan failure , or the baffle door could be frozen solid so confirm the parts are faulty before replacing do some test checks and inspections. If the fridge is getting too cold then the baffle door could be cracked or even frozen in the open position.
You can test the baffles motor for ohms with a multimeter if it tests OL it means the internal winding is damaged and you need to replace. Test the micro or reed switch as the same time to ensure continuity.
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