How to Start a PTH490D Resistor Compressor

The PTH490D is a resistor relay used to aid in powering compressors found inside several refrigerator brands, including Maytag. The PTH490d is manufactured by Matsushita. If the refrigerator starts making a clicking noise, seems to not be cooling properly or if there is a puddle of water gathered on the floor, it is possible a new PTH490D needs to be installed and started. Purchase a replacement at a home appliance wholesaler or order it directly from the manufacturer.

Helper
Phillips screwdriver
Hand vacuum

Instructions

- 1
  Pull the refrigerator out from the wall. Ask a friend to help, if needed. Unplug the refrigerator to avoid electric shock.
- 2
  Remove the lower grill panel on the refrigerator with a Phillips screwdriver. Loosen and take out the retaining screws that hold the panel in place. They are located at each of the four corners. Pull the panel away.
- 3
  Use a hand vac to remove excess dirt and dust before beginning work.
- 4
  Remove the wires from the resistor terminals with a Phillips screwdriver. Set the new resistor in place, attach the wires to the respective terminals and tighten them with the screwdriver.
- 5
  Plug the refrigerator back into the wall. The resistor will start and cycle upon electrical contact and should power up the compressor.
- 6
  Replace the grill panel, insert the retaining screws and tighten them with the screwdriver.

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