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To replace a thermostat, switch off the power to the thermostat, and unscrew the old thermostat from the wall. Fasten the new thermostat, and switch on the power to test it. You need a screwdriver, a utility knife and a new thermostat to accomplish this task.


Replace a home thermostat by turning off the power supply to the unit, and removing the face of the thermostat. Disconnect wires from the old thermostat, and remove the mounting plate. Put on the new thermostat mounting plate, connect the wires appropriately, fix the new face, and power the unit.


To replace a car thermostat, unbolt the gooseneck housing around the thermostat near the top of the engine, unbolt and remove the old thermostat and gasket, bolt in the new thermostat and gasket and reconnect the gooseneck housing. If the gasket is not a self-sealing gasket, sealant must be applied


To replace a refrigerator thermostat, unscrew its housing, disconnect the wires, extract the existing thermostat, push the new thermostat into the evaporator tube, connect the wires and adjust the refrigerator temperature. This process requires the refrigerator owners' manual, a flashlight, a screwd


To replace an oven's thermostat, locate the thermostat assembly in the oven, then remove the old thermostat by disconnecting the capillary tube and sensor bulb and unscrewing the thermostat from the control panel. To install the new thermostat, the process is then essentially reversed.


To replace an electric-heat thermostat, disconnect the electricity, remove the thermostat and its housing, and disconnect its wires. Connect the new thermostat, insert the batteries, attach the housing, and reconnect the power. The required supplies include a screwdriver, electrical and masking tape


To replace a thermostat in a freezer, remove the panels and any retaining clips, disconnect the thermostat wires from the terminal, remove the thermostat, place and connect the new thermostat, and reassemble the freezer. The necessary materials are a new thermostat, screwdriver and needle nose plier


To replace a fridge thermostat, disconnect the fridge from power, remove the thermostat cover, detach the terminal wires, and remove the old thermostat. Install the replacement thermostat in the place of the old one, plug in the fridge, and reset the temperature in order to test the new thermostat.


To replace a three-wire thermostat, connect each of the three wires to the right connection. The three wires are red, white, and blue or yellow, depending on the manufacturer. If they are connected incorrectly, the thermostat can burn out.


To replace a Nest thermostat, turn off the power to the equipment, remove the cover, and label the wires before disconnecting them and removing the base. A Nest thermostat can be replaced by another Nest model or any other programmable thermostat.