21D83M-843 Furnace Fan Control for Lennox 83M00 50A66-122 50A66-123 White Rodger


Product Description

Up for sale is a White-Rodgers part number 21D83M-843.

This item is Brand New, In the Package and Unused.

Nitride Ignition. Integrated Furnace Control.

Controls Gas Valve, Ignitor, Blower, Inducer, 

Humidifier and Air Cleaner. Replaces Lennox models.

Kit includes:

  • 1  50A66-843 Ignition Control Board
  • 1  Wiring harness (9-pin to 12-pin)
  • 1  Wiring harness (4-pin to 6-pin)
  • 1  Mounting panel
  • 4  Stand-off fasteners
  • 1  Circuit breaker
  • 1  4" blue wire
  • 2  Wiring diagrams


  • Includes diagnostic indicator flash codes
  • 3 fan speeds
  • Remote flame sense
  • Humidifier and electronic air cleaner connections (optional)


  • Input Voltage: 25 VAC 50 / 60 Hz
  • Maximum Input Current @ 25 VAC: 0.45 amp
  • Valve Relay: 1.5 amp @ 25 VAC 50 / 60 Hz 0.6 pf
  • Ignitor Relay: 2.0 amp @ 120 VAC 50 / 60 Hz (resistive)
  • Inducer Relay: 2.2 FLA  3.5 LRA @ 120 VAC
  • Circulator Relay: 14.5 FLA  25.0 LRA @ 120 VAC
  • Operating Temperature Range: -40 to +175F (-40 to +79C)
  • Humidity Range: 5% to 93% relative humidity (non-condensing)

Timing Specifications:

  • Pre-purge: 15
  • Heat delay to fan ON 45
  • Heat delay to fan OFF 60/90/120/180
  • Cool delay to fan ON 2
  • Cool delay to fan OFF 2/45
  • Auto reset 60 minutes

Replacement for Lennox numbers: 10M9301, 32M8801, 56L8401, 24L8501, 63K8901, 97L4801, 100925-01, 100925-03, 17W9201, 23W5101, 30W2501, 69M0801, 69M1501, 83M00.

Replacement for White Rodgers numbers:50A65-120, 50A65-121, 50A62-120, 50A62-121, 50A62-820, 21D83M-843, 50A66-122, 50A66-123.

Product Reviews

Write a Review
  • 4
    AC control Board

    Posted by Nat on 28th Aug 2018

    I had to buy longer connection wire for thr hopkup of one line. Existing board wire did not reach one connection. Works well after replacement.

  • 5
    Furnace control board

    Posted by Unknown on 5th Apr 2018

    Arrived in two days with $5 shipping, installed and works great.

  • 5
    Excellent Service

    Posted by Happy Hippo on 22nd Mar 2018

    Excellent service with the product half the cost. Item arrived the next day as stated. Top notch!

  • 5
    Easy installation

    Posted by Unknown on 5th Mar 2018

    Great product at haalf the cost of local supply houses. Easy to install.

  • 5
    Warm and Toasty

    Posted by Gary on 9th Feb 2018

    Furnace went out, wasn't going to pay an arm and a leg fora tech to come out and tell me what I already knew. McCombs had the best price I could find. Part was received withing 5 days of my order. Now my wife and I are Warm and toasty again!
    I have passed my experience on to my friends and family.
    Thanks McCombs supply Inc.

  • 5

    Posted by Happy Customer on 4th Dec 2017

    The product arrived quickly and in tact. The product was installed by the service technician and it's been working great. We now have heat consistently. Thanks McCombs Supply!!

  • 5
    Exact replacement part

    Posted by Joseph on 13th Nov 2017

    Heating repair tech wanted $600.00 to replace the corroded circuit board which was causing the furnace the cycle the purge motor constantly. Suggested the money would be better spent for a new furnace. Part ordered from McCombs and arrived two days later. Works perfectly. THANKS!

  • 5
    Exact Part and Quick Service!

    Posted by Eric Keim on 8th Mar 2017

    After determining our Lennox circuit board had failed, I started shopping on-line for a replacement part. McCombs had the part for unit, and it was at my front door within 4 days. According to an HVAC friend, McCombs' price was about half of what I would have paid locally. Got it all put together and the furnace is running great again. It seems a furnace or A/C will always fail when you need them the most. Thank you for the quick service, McCombs!

  • 5
    Great Product

    Posted by MIKE Derderian on 29th Nov 2016

    The circuit board was easy to transfer the wiring and install. It brought my heating unit back to life!

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