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Problem: My heat pump defrost control board is bad. I can not utilise my heat pump considering the defrost control board is bad. We are burning up in our home without air-conditioning. Techs are days behind before they can come and set our trouble. It will be days earlier we receive a new defrost lath replacement because of shipping time. Is there any fashion that I tin can featherbed the defrost command board so we can get the air conditioning to cool our domicile?  Please help if you lot tin can!

Answer: Aye! I can help! Nosotros accept this question asked quite often so I decided to write a mail service on how to temporarily bypass a heat pump defrost control board and so people can go their air workout working again. If y'all are skillful with your hands and know a little about electric wiring then you should be able to bypass the rut pump defrost board. We have 2 actually good YouTube videos that explain how to featherbed a heat pump defrost board to allow for cooling or to allow for the ac to work.  The first video was made past SuperCool Slide Rule. The 2nd YouTube video was fabricated past AC Service Tech LLC. Thanks to SuperCool Slide Rule and AC Service Tech LLC for making these slap-up educational and informative videos!  I have the steps written down stride by pace beneath. If you need a new estrus pump defrost command lath so we sell many different name make defrost control boards on the following page: Delight click hither if you lot are interested in the defrost command boards that nosotros sell.  If y'all take any questions or would like for usa to look up whatsoever parts then please email u.s.a. anytime or comment below. Our email accost is arnoldservice@gmail.com We Would Love to try and Help You Out and Earn Your Business organization!

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Steps to bypass a heat pump defrost control lath are:

  1. Plow off both loftier voltage and low voltage power by pulling the unit of measurement's disconnect and turning the indoor air handler off. Test with a voltmeter set to "Volts AC" to make sure the ability is off.
  2. I recommend taking a motion-picture show of how the defrost control board is wired earlier you brand any changes to the board.
  3. For the heat pump to absurd you will need to energize or take working three parts of the estrus pump. (1) 220-volt condenser fan (2) the 24-volt contactor and the 24-volt reversing valve. Well-nigh heat pumps have the reversing valve energized in the cooling mode except Rheem and Ruud units. If you have a Rheem or Ruud unit so yous would not need to practice the part about energizing the reversing valve.
  4. Place the outdoor condensing fan relay and bring together the ii fan relay wires together then that the outdoor condensing unit's fan will run. Tape, insulate, and secure the two high voltage (210-245 volt) wires so that the wires do not touch or ground out to the body of your heat pump unit.
  5.  There are two depression voltage wires that go to the 24-volt gyre on the contactor. Disconnect, insulated, and secure the ii existing wires from the contactor. I think information technology would be all-time to run two new wires to the 24-volt contactor coil.  Ane new wire on the ability side of the contactor coil and 1 mutual "C" or ground wire on the reverse side of the ability wire on the contactor.
  6. Join and wire nut together with the hot yellow (Y) wire that comes from the thermostat to 1 of the wires that get to the contactor (to energize the contactor) and the yellow (Y) wire should too be attached to the reversing valve orangish wire. I would trace the depression voltage wires down to make sure that you have the correct wires that are going to both the contactor and reversing valve.  The contactor should take two wires (ability and C) and the reversing valve should take 2 wires (power and C).
  7. FYI- To energize both the contactor and reversing valve the contactor has two depression voltage wires that get to the contactor coil and the reversing valve should have two low voltage wires that go to the reversing valve gyre. I of the two wires that go to both the contactor and reversing valve is the power wire which we volition attach to the "Y" thermostat wire. The indoor thermostat when the thermostat calls for oestrus pump cooling takes the R (ruby wire from the 24-volt indoor transformer) and makes the connection to the "Y" wire to energize the contactor and brand the contactor close. The other two wires from both the contactor curlicue and reversing valve scroll is the C or called the common wire. For each device to be energized there must be a power wire "Y" and a C common wire attached.
  8. So nosotros desire to energize the fan, the contactor, and reversing valve in order to bypass the defrost control board. Next, you lot would want to connect the common wires together to the common side of the contactor and reversing valve. Join, and wire nut together with the other two contactor and reversing valve common wires.  Most of the time the blueish thermostat wire is the common (C) wire. I would recommend that you take the embrace off your thermostat and make sure and see which wire color is connected to the "C" "Com" connection on your thermostat. You would never want to straight connect the R and C terminals together considering this would produce a straight curt to ground and fire up many of the heat pump organization's low voltage controls if they are not protected by a low voltage fuse.
  9. As a review: You should have two wires connected to the Y "Yellow" wire. One of the wires attached to the Y wire would go to one side of the contactor to provide power for the contactor and the other wire would get to the reversing valve to provide power for the reversing valve when your thermostat calls for cooling. The other common wire from your thermostat (you would need to brand certain you have the right colour for the wire that is attached to the C  "COM" of your thermostat). Two wires would exist attached to this C common wire from your thermostat.  You would attach one of the wires to the C common side of the contactor and the other wire to the C common side of the reversing valve.  You should be ready to apply power and test. All-time of luck. This should work if wired correctly.


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