Subzero Model 3211RFD continually runs - Refrigerators

Remove the top panel and check the coil and the condenser fan motor,that coil should be cleaned at least once a year.the way i clean the coil is remove the cover on the left side,usually just two phillips screws,this is the cover behind the front panel,then on the left side you'll see a quick disconnect,just unplug the wire harness and it will shut down the machine,get a towel and cover the opening,then on the right side of the coil,vac it off with a shop vac,use the brush attachment so you don't damage the fins on the coil,then put the hose on the other side of the vac so it blows and blow through the coil,the towel keeps all the dust inside the cabinet so it doesn't blow out all over your kitchen, do this a few times,lift the towel after every blow and vac up all the dust,then depending on how the top is move the towel over to cover the right side and blow through the coil where the fan blade is,it's best to blow it out from both sides,also before you move the towel over to the other side,put it on blow,stick the hose under the towel and blow into the cabinet to lossen all the dust up then move the towel and blow out the coil,vac out all the walls inside the cabinet.this is the number one killer of sub zero machines,if the coil isn't cleaned out,the oil in the fan motor dries out and the motor dies and then the compressors can overheat and need to be changed,you're talking big money.if the fan is ok up there and the temps.are normal inside the cleanout should take care of it running to long,the heat from the machine escapes through the coil so if it's clogged with dust it will run hot and longer than normal.hope this helps and good luck with your machine.