Defrost Board Replacement

When changing the defrost circuit board it is a good idea to also change the defrost temperature sensor. We will be happy to identify the correct parts for your application if you provide us the heat pump brand and model number. Always use the correct factory parts for this repair.

Make sure the power is disconnected for the outdoor unit as well as the inside air handler. The low voltage to the board is supplied from the transformer in the air handler and damage may result to the control system if control power is left on. Remove the old circuit board leaving the wiring intact. Install the new defrost circuit board. Reconnect wires one at a time and reconnect to the same terminals for the new board. If there are any changes in the style of the board pay close attention to terminal markings and read any instructions provided.

The defrost sensor is strapped on a lower copper connection on the outdoor coil near the small refrigerant line that goes supplies refrigerant to the air handler. It has 2 wires that connect on 2 terminals of the defrost board. The strap around the copper line has an overlap style retaining clip that holds the sensor on the copper. I have added a picture showing the overlap style retaining clip open. Remove the old sensor and install the new sensor. Disconnect old sensor from defrost board and reconnect new sensor.



About Us

Welcome to Shortys HVAC Supplies. We are located on the South West side of Indianapolis, IN. Our purpose is to provide Original Equipment Manufacturer parts for the repair and maintenance upkeep of furnaces, air conditioners, ventilation systems and pumps to the general public as well as contractors and commercial building maintenance staff.

We sell brand new OEM parts for most manufacturers such as Carrier, Bryant, Payne, Lennox, Armstrong Aire, Ducane, Trane, American Standard, Heil, Tempstar, Nordyne, Goodman, Rheem, Ruud, York, Coleman, Modine, Reznor, Armstrong Pumps, Bell and Gossett pumps, Weil McLain, Lochinvar, McDonnell Miller, Hoffman Specialties, Manitowoc, Scottsman and we strive to make sure you get the correct part for your application.

Give us a call with the information from your equipment nameplate and we will do our best to help. We can be reached at our local phone number 317-821-8770, Toll Free 877-821-8770 or by fax at 317-821-8772. Our physical address is 7720 S Mooresville Rd in West Newton , IN 46183. Business hours are 8-5 EST M-F. Prior to making repairs please consult your manufacturers instructions and follow all safety precautions. Improper repairs can lead to equipment damage or personal injury or death. If you are unsure of your ability please call a professional company.

Refunds And Returns

Items that are returned must be in original package and in new condition. We are not responsible for return shipping. They must be returned within 30 days of the purchase date. Any returns after 30 days will not be accepted. Refunds takes 4-7 days to be processed and appear back on the card used. A 25% restocking charge will be deducted from the original purchase price. If an item has been installed or altered in any way no refund will be processed. If you receive an item that is damaged please let us know ASAP so we can assist you.
Shipping Rate For Continental US Only. Please contact us for rates to Canada before ordering.




Company Name

Shortys HVAC Supplies LLC


7720 S Mooresville RD
West Newton, IN
USA 46183

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Shortys HVAC Supplies LLC 2024