If you don't have a complete understanding of what happens during the defrost cycle on a heat pump, you're not the only one! This video, Heat Pump Defrost Board Troubleshooting Tips, will show you step-by-step how the defrost mode makes the outdoor fan heat pump melt the ice that freezes up on it during the cold winter days. You need to know how to troubleshoot a heat pump and make it go into defrost mode. The defrost cycle melts the iced-up coil on the heat pump outside on really cold days by essentially going into air conditioning mode. Because remember, in cooling mode, the outdoor coil becomes the hot coil. The heat pump defrost board controls the switchover valve, better known as the reversing valve. A defrost temperature sensor is part of the heat pump wiring that talks to the defrost control board on a goodman, carrier, lennox, ruud, rheem, york, american standard, amana, bryant, heil, frigidaire heat pumps. Please visit our website @ http://www.foxfamilyhvac.com/ If you'd like to book an appointment with Fox Family Heating and Air in Sacramento, El Dorado, or Placer County, CA https://book.housecallpro.com/book/Fox-Family-Heating-and-Air-Conditioning/babd3396dba440e1afac01c631d95f1d Visit us on our social media pages: Facebook @ https://www.facebook.com/FoxFamilyHeatingAirConditioning Twitter @ https://twitter.com/foxfamilyhvac LinkedIn @ https://www.linkedin.com/in/greg-fox-46ab48110/ Tumblr @ http://foxfamilyhvac.tumblr.com/ Reddit @ https://www.reddit.com/user/foxfamhvac 00:00 Intro 1:35 Defrost Cycle 2:08 Heat Pump Low Voltage Wiring 3:18 The Defrost Cycle Activates 5:16 What Voltages Should We Be Reading? 6:12 Ending the Defrost Cycle 7:00 Troubleshooting an Iced Up Heat Pump 8:42 See, Heat Pumps Aren't That Difficult