How to Replace the Defrost Thermostat on a Dehumidifier


When your dehumidifier is not working properly, a common issue is a faulty defrost thermostat. The defrost controls are designed to sense when frost starts to accumulate on the evaporator coil; it then turns off the compressor automatically. The fan still runs, pushing air on the coil to melt the frost. Once the coil has been defrosted, the compressor turns back on automatically and the dehumidifier is fully functional again. A faulty defrost thermostat needs to be replaced to keep your dehumidifier working properly.

Things You'll Need

  • Screwdriver
  • Remove the screws that hold the front grille in place; most have at least two screws. Push on both sides and pull the grille upward and forward to detach it.

  • Remove the air filter and bucket just as you removed the front grille.

  • Unscrew the screws that hold the control box in place, usually there are three. Unscrew the screws all around the cabinet, there are usually nine. Remove the cabinet from the base.

  • Unscrew the screw holding the earth wire in place in front of the control box. Unhook the control box, removing it from the two hooks holding it in place on the shroud.

  • Detach all the leads of the thermostat and defrost controls in the control box. Take the defrost control out of the suction tube. Take the capacitor out of the control box. Unscrew the screws holding the thermostat in place in the control box, there are usually two screws. Remove the thermostat.

  • Replace the defrost control and thermostat. Reassemble the dehumidifier.

Tips & Warnings

  • Consult your owner's manual for reference or further questions.

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