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MEO White Rodgers 47D01U 843 Universal Heat Pump Defrost Control P14903390MEO-317041 https://cdnimages.opentip.com/full/MEO/MEO-317041.jpg White Rodgers 47D01U 843 Universal Heat Pump Defrost Control Manufacturer Part Number: 47D01U-843Part Description:W-R47D01U-843 Universal Heat Pump Defrost ControlFeatures / BenefitsReplaces over 400 single stage defrost models Selectable timed defrost or demand defrost mode for greater efficiency Reversing valve can be energized in heat or cool (O/B) One button configuration to any OEM system Integrated outdoor thermostat eliminates need for additional components Access set up and diagnostic menus from any orientation Brownout and short cycle protection Pat. 9,037,303, 9,412,328, 9,830,887, 9,964,345Specifications Universal or OEM Direct Replacement: Universal Replacement Stages:Single Description:Defrost Control Voltage:Input 24 Vac, 50/60Hz Line Voltage:208/240 Vac Inducer Motor/Blower Motor:PSC Mounting Options:Tray Ambient Operating Temperature:-40 to 150°F (-40 to 65°C) Operating Humidity:0% to 95% relative humidity (non-condensing) Overall Dimensions:1.75\"H X 4.72\"W 5.75\"DReplaces virtually all single stage defrost controls. Selectable demand or timed defrostProduct Features: Replaces virtually all single stage defrost controls. Selectable demand or timed defrost Universal mounting with rotating display Preconfigured for major OEM brands Integrated indoor thermostat Access set up and diagnostic menus from any orientatio. 14903390 786710551802 2.4000lbs 0.00 0.00 0.00
White-Rodgers
137 2027-01-07 5 In Stock
customer review - by , October 10, 2025
5/ 5stars
Worked great
customer review - by , August 8, 2025
5/ 5stars
Fixed the AC at my mothers house after a lightning strike killed both boards and a thermostat. We replaced the thermostat and the air handler board but didn't realize the outdoor unit was bad as well. Found an OEM replacement but decided to see what was out there and found this little gem. It solved the problem and improved the 20 year old system by adding defrost by demand. Should help on the power bill. No big amount but every dollar helps. Had to watch the videos and read the manual a few times to understand exactly how to connect it. But once I figured it out it worked like a charm.And like the title says it was cheaper than OEM, like half the cost.
customer review - by , March 3, 2025
5/ 5stars
Installed in 2019 on a 5-Ton Carrier HP. I found this board easy to install, especially if you read the instructions and label the wires. Initial setup was straightforward, as I decided on the various parameters in advance. After the first winter, I changed the minimum compressor cut-out to 0 degrees, as my heat pump will still make heat at that temp. Only complaint is the display is not so bright, and requires shade to read all the messages. Also very sensitive to resistance on the Hi-pressure cut-out. Had a problem with board locking out on hi-pressure until I found the loose connection. Make sure all connections are tight!
customer review - by , November 11, 2024
5/ 5stars
First board installed failed within 2 weeks lost connectivity to the ambient temp sensing unit. Call them got a warranty done installed the second circuit board and it has been working fine for weeks. Defrost happens way less often as it is more closely monitored by the temperature sensors. Instructions do not specify where to install the coil temp sensor so trial and error is required. Beyond those complications it's been working great.
customer review - by , November 11, 2024
5/ 5stars
My defrost control board was bad from the factory. My HVAC technician wanted $500 just to replace the OE board under warranty. There were some things I didnt like about the old one like defrosting when it wasn't even needed. After researching, I found this board was a direct replacement and gave the demand defrost option. It is a bit much to process for people that aren't electrically inclined, but I am used to reading wiring diagrams and had it mostly perfect the first time. I had to disable the high pressure switch option in the board as my HVAC system didn't have one. After that it worked great!
customer review - by , June 6, 2024
5/ 5stars
Revived a non-existent portable 5-ton unit with this guy, works perfect!
customer review - by , January 1, 2024
5/ 5stars
Installed it on a Carrier heat pump after its control board died. I had to adapt the wiring a bit as some heat pump wires were short but the system started working flawlessly again.
customer review - by , April 4, 2023
4/ 5stars
I have installed this defrost control on two different systems, the first a 2007 Goodman at my old home, and more recently a 2010 ICP Tempstar. Both applications were to upgrade the units from their OEM time/temperature defrost to demand defrost. When configured for demand defrost, this board will put the unit into defrost with the coil sensor is below the defrost enable temperature, and either when it senses frost buildup by way of a self-calibrating difference in temperature between the outdoor air sensor and the coil sensor - or when 6 hours of runtime have passed to help redistribute oil throughout the system.On the Goodman system, I used the board solely for its demand defrost functions and short cycle protection (which the OEM board lacked). Installation was easy, and the demand defrost functioned as intended with the coil sensor placed in the same sensor as the original Goodman defrost temp switch.With the ICP heat pump, I utilized the demand defrost function and all unit protections including pressure switch monitoring. I also made use of the aux heat lockout by using the brown wire in the control wiring to directly connect the aux terminal of the thermostat to the W-In terminal on the board. I set the aux heat lockout to >40 degrees. Installation was a overall not too difficult since the ICP unit has a well illustrated wiring schematic. Here's where the issue is... I placed the coil temp sensor in the OEM defrost switch location, which is the line coming off the spider fed from (I believe) the liquid line. This location gets the coldest the quickest, and because of that, it was triggering defrost before there had hardly been a chance for frost to even build on the coil. This was even with low dew points, so frost wasn't quick to form at all. I relocated the coil temp sensor to one loop in the coil below its original location. Now the unit waits far too long to defrost, sometimes to the point where the whole coil is covered and even to the point the thermostat is calling for aux heat. Briefly grabbing and warming up the air temperature sensor will kick it into defrost and fully thaw the coil. Placing the sensor back in the OEM spot changes its behavior to before, kicking into defrost every 40 minutes of runtime with no frost. From what I am reading about this board, it self calibrates to find an optimum delta-T, which I do believe as the board's behavior had changed... just to the point where the delta-T is too large. One thing this board really needs is the option to either have the delta-T set to Auto or Manual where the installer can self set the optimum delta-T value for the given unit. This is why I have docked one star. The manual could also use some improvements, particularly in wording on how/where to locate the coil sensor when the OEM location is not optimum. Also, it should mention the test function will manually put the unit into defrost and end defrost when the coil temp sensor reaches the defrost termination temperature (not approx 30 seconds).Update: I was able to get the board to initiate defrost earlier by moving the coil sensor to a location where the coil first begins to accumulate frost. Would still be nice if the board allowed you to manually set a delta-T value so that you could customize the defrost initiation parameter.Another issue I have with this product is the way the reversing valve shift delay works. With brands such as Goodman, Trane, and others which shut off the compressor during shifting the reversing valve to eliminate compressor noise, they de-energize the compressor as soon as the reversing valve is energized or de-energized. This allows the compressor to shut off before the reversing valve shifts. The 47D01U-843 on the other hand, energizes/de-energizes the reversing valve, and waits 1 second before de-energizing the compressor. This causes the reversing valve to shift while the compressor is still running, somewhat defeating the purpose of implementing the shift delay altogether. When the unit shifts into defrost or out of defrost, the scroll compressor makes a sound similar to backpedaling, but worse. This probably wouldn't happen had the compressor been shut off before the reversing valve shifts. I would like to see this corrected.Overall, I still do think this is a great product.
customer review - by , March 3, 2023
5/ 5stars
Not exactly diy but it is a great setup if you know what you are doing
customer review - by , September 9, 2022
5/ 5stars
The defrost board on my long discontinued heat pump failed. Rather than trying my luck on finding a used part I decided that I would try this and gain auto defrost at the same time. After a careful study of the new and old board and current wiring I was able to get this installed and working.

White-Rodgers 47D01U-843 Universal Heat Pump Defrost Control, Price/each

stars Rating 5 | 14 reviews
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UPC: 786710551802
SKU: MEO-317041
Price: $137.00
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Product Description

Price is for each.

Manufacturer Part Number: 47D01U-843

Part Description:
W-R47D01U-843 Universal Heat Pump Defrost Control

Features / Benefits

  • Replaces over 400 single stage defrost models
  • Selectable timed defrost or demand defrost mode for greater efficiency
  • Reversing valve can be energized in heat or cool (O/B)
  • One button configuration to any OEM system
  • Integrated outdoor thermostat eliminates need for additional components
  • Access set up and diagnostic menus from any orientation
  • Brownout and short cycle protection
  • Pat. 9,037,303, 9,412,328, 9,830,887, 9,964,345

    Specifications
  • Universal or OEM Direct Replacement: Universal Replacement
  • Stages:Single
  • Description:Defrost Control
  • Voltage:Input 24 Vac, 50/60Hz
  • Line Voltage:208/240 Vac
  • Inducer Motor/Blower Motor:PSC
  • Mounting Options:Tray
  • Ambient Operating Temperature:-40 to 150°F (-40 to 65°C)
  • Operating Humidity:0% to 95% relative humidity (non-condensing)
  • Overall Dimensions:1.75"H X 4.72"W 5.75"D


Replaces virtually all single stage defrost controls. Selectable demand or timed defrostProduct Features: Replaces virtually all single stage defrost controls. Selectable demand or timed defrost Universal mounting with rotating display Preconfigured for major OEM brands Integrated indoor thermostat Access set up and diagnostic menus from any orientatio.

warning tips WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
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Customer Reviews
5 stars
13
4 stars
1
3 stars
0
2 stars
0
1 stars
0
By Greg L.
Date: October 24, 2025
Worked great
Rating: 5 stars [5 of 5 Stars!]
By Doug P
Date: August 06, 2025
Fixed the AC at my mothers house after a lightning strike killed both boards and a thermostat. We replaced the thermostat and the air handler board but didn't realize the outdoor unit was bad as well. Found an OEM replacement but decided to see what was out there and found this little gem. It solved the problem and improved the 20 year old system by adding defrost by demand. Should help on the power bill. No big amount but every dollar helps. Had to watch the videos and read the manual a few times to understand exactly how to connect it. But once I figured it out it worked like a charm.And like the title says it was cheaper than OEM, like half the cost.
Rating: 5 stars [5 of 5 Stars!]
By S. Mayo
Date: March 24, 2025
Installed in 2019 on a 5-Ton Carrier HP. I found this board easy to install, especially if you read the instructions and label the wires. Initial setup was straightforward, as I decided on the various parameters in advance. After the first winter, I changed the minimum compressor cut-out to 0 degrees, as my heat pump will still make heat at that temp. Only complaint is the display is not so bright, and requires shade to read all the messages. Also very sensitive to resistance on the Hi-pressure cut-out. Had a problem with board locking out on hi-pressure until I found the loose connection. Make sure all connections are tight!
Rating: 5 stars [5 of 5 Stars!]
By Buying is satisfying
Date: November 13, 2024
First board installed failed within 2 weeks lost connectivity to the ambient temp sensing unit. Call them got a warranty done installed the second circuit board and it has been working fine for weeks. Defrost happens way less often as it is more closely monitored by the temperature sensors. Instructions do not specify where to install the coil temp sensor so trial and error is required. Beyond those complications it's been working great.
Rating: 5 stars [5 of 5 Stars!]
By Robert Olson
Date: November 01, 2024
My defrost control board was bad from the factory. My HVAC technician wanted $500 just to replace the OE board under warranty. There were some things I didnt like about the old one like defrosting when it wasn't even needed. After researching, I found this board was a direct replacement and gave the demand defrost option. It is a bit much to process for people that aren't electrically inclined, but I am used to reading wiring diagrams and had it mostly perfect the first time. I had to disable the high pressure switch option in the board as my HVAC system didn't have one. After that it worked great!
Rating: 5 stars [5 of 5 Stars!]
By Cory
Date: June 09, 2024
Revived a non-existent portable 5-ton unit with this guy, works perfect!
Rating: 5 stars [5 of 5 Stars!]
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