Skip to main content
Hi! Sign in or registerDaily DealsBrand OutletGift CardsHelp & Contact
Sell
Watchlist
My eBay
  • Summary
  • Recently Viewed
  • Bids/Offers
  • Watchlist
  • Purchase History
  • Buy Again
  • Selling
  • Saved Feed
  • Saved Searches
  • Saved Sellers
  • My Garage
  • Sizes
  • My Collection
  • Messages
  • PSA Vault
Please sign-in to view notifications.
Loading...
eBay Home

Motors

Parts & accessoriesCars & trucksMotorcyclesOther vehicles

Clothing & Accessories

WomenMenHandbagsCollectible Sneakers

Sporting goods

Hunting EquipmentGolf EquipmentOutdoor sportsCycling Equipment

Electronics

Computers, Tablets & Network HardwareCell Phones, Smart Watches & AccessoriesVideo Games & ConsolesCameras & Photo

Business & Industrial

Modular & Pre-Fabricated BuildingsTest, Measurement & Inspection EquipmentHeavy Equipment, Parts & AttachmentsRestaurant & Food Service

Jewelry & Watches

Luxury WatchesWristwatchesFashion JewelryFine Jewelry

Collectibles & Art

Trading CardsCollectiblesCoins & Paper MoneySports Memorabilia

Home & garden

Yard, Garden & Outdoor Living ItemsTools & Workshop EquipmentHome ImprovementKitchen, Dining & Bar Supplies

Other categories

Books, Movies & MusicToys & HobbiesHealth & BeautyBaby Essentials
All BrandsAll CategoriesSeasonal Sales & Events
Advanced
Sponsored
Sponsored

Filter

    • Category

      • All
        • Business & Industrial
        • Selected categoryHVAC & Refrigeration
          • HVAC & Refrigeration: Parts & Accessories
          • Other HVAC & Refrigeration
    • Price

      • Under $30.00
      • $30.00 to $45.00
      • Over $45.00
      $
      to
      $
      Please provide a valid price range
      Available inventory
      $0
      $1000+
    • Condition

      • New (2) Items (2)
      • Used (31) Items (31)
    • Buying Format

    • Item Location

      • Within25 mi
    • Shipping and pickup

      • Arrives in 2-4 days
      • Free Shipping
      • Local Pickup within25 miles
    • Show only

      • Free Returns
      • Returns Accepted
      • Authorized Seller
      • Completed Items
      • Sold Items
      • Deals & Savings
      • Authenticity Guarantee

33 results for EMERSON Comfort Alert Ultra Tech Diagnostics 543-0012-00

  • All
  • Auction
  • Buy It Now
  • All Listings- Filter Applied
  • Auction
  • Buy It Now
  • Any Condition- Filter Applied
  • New
  • Used
  • Arrives in 2-4 days
  • Free Shipping
  • Best Match
  • Time: ending soonest
  • Time: newly listed
  • Price + Shipping: lowest first
  • Price + Shipping: highest first
  • Distance: nearest first
  • Gallery View
  • Shop on eBay
    Shop on eBay
    Opens in a new window or tab
    Brand New
    $20.00
    or Best Offer
    Sponsored
  • Shop on eBay
    Shop on eBay
    Opens in a new window or tab
    Brand New
    $20.00
    or Best Offer
    Sponsored
    • EMERSON Comfort Alert Diagnostics 543-0012-00
      EMERSON Comfort Alert Diagnostics 543-0012-00
      Opens in a new window or tab
      Pre-Owned
      $40.00
      Buy It Now
      Free delivery
      Sponsored
      netsellerzoc (46,851) 99.9%
    • Emerson 42-101504-04 Comfort Alert Ultratech Diagnostics 543-0033-01
      Great price compared to similar brand new items
      Emerson 42-101504-04 Comfort Alert Ultratech Diagnostics 543-0033-01
      Opens in a new window or tab
      Brand New
      5.0 out of 5 stars.
      2 product ratings - Emerson 42-101504-04 Comfort Alert Ultratech Diagnostics 543-0033-01
      $79.99
      Buy It Now
      Free delivery
      Free returns
      Sponsored
      Save up to 10% when you buy more
      Top Rated Plus
      • Sellers with highest buyer ratings
      • Returns, money back
      • Ships in a business day with tracking
      Learn More
      Top Rated Plus
      antiqueengineering (9,122) 99.8%
    • Emerson Comfort Alert Diagnostics 543-0012-00
      Emerson Comfort Alert Diagnostics 543-0012-00
      Opens in a new window or tab
      Pre-Owned
      $29.99
      or Best Offer
      Free delivery
      Sponsored
      darwil-eix573 (6,598) 98%
    • EMERSON Comfort Alert Diagnostics 543-0010-00
      EMERSON Comfort Alert Diagnostics 543-0010-00
      Opens in a new window or tab
      Pre-Owned
      $55.00
      Buy It Now
      Free delivery in 2-4 days
      Sponsored
      netsellerzoc (46,851) 99.9%
    • EMERSON COMFORT ALERT ULTRA TECH DIAGNOSTICS 543-0012-00
      EMERSON COMFORT ALERT ULTRA TECH DIAGNOSTICS 543-0012-00
      Opens in a new window or tab
      Pre-Owned
      $17.99
      Buy It Now
      Free delivery
      Sponsored
      bidwar1978 (482) 85.7%
    • EMERSON Comfort Alert Ultra Tech Diagnostics 543-0012-00
      EMERSON Comfort Alert Ultra Tech Diagnostics 543-0012-00
      Opens in a new window or tab
      Pre-Owned
      $14.28
      or Best Offer
      +$12.94 delivery
      from Canada
      Sponsored
      hvac_motors_and_parts (546) 100%
    • EMERSON COMFORT ALERT ULTRA TECH DIAGNOSTICS 543-0033-02 - USED
      EMERSON COMFORT ALERT ULTRA TECH DIAGNOSTICS 543-0033-02 - USED
      Opens in a new window or tab
      Pre-Owned
      5.0 out of 5 stars.
      1 product rating - EMERSON COMFORT ALERT ULTRA TECH DIAGNOSTICS 543-0033-02 - USED
      $14.99
      or Best Offer
      +$10.50 delivery in 2-4 days
      Sponsored
      qualityheatingandcooling (2,776) 100%
    • Emerson Comfort Alert Diagnostics 543-0032-00
      Emerson Comfort Alert Diagnostics 543-0032-00
      Opens in a new window or tab
      Pre-Owned
      1.0 out of 5 stars.
      1 product rating - Emerson Comfort Alert Diagnostics 543-0032-00
      $30.00
      Buy It Now
      Free delivery
      Free returns
      Last one
      Sponsored
      hvacpartswarehouseonline (2,333) 100%
    • EMERSON COMFORT ALERT ULTRA TECH DIAGNOSTICS 543-0012-00 FREE SHIPPING
      EMERSON COMFORT ALERT ULTRA TECH DIAGNOSTICS 543-0012-00 FREE SHIPPING
      Opens in a new window or tab
      Pre-Owned
      $16.17
      Buy It Now
      Free delivery
      Sponsored
      wahen_29 (497) 88.5%
    • EMERSON COMFORT ALERT ULTRA TECH DIAGNOSTICS 543-0033-02  (6857) C3 CP
      EMERSON COMFORT ALERT ULTRA TECH DIAGNOSTICS 543-0033-02 (6857) C3 CP
      Opens in a new window or tab
      Pre-Owned
      5.0 out of 5 stars.
      1 product rating - EMERSON COMFORT ALERT ULTRA TECH DIAGNOSTICS 543-0033-02 (6857) C3 CP
      $29.00
      or Best Offer
      Free delivery
      Last one
      Sponsored
      acray1234 (2,822) 100%
    • emerson comfort alert diagnostics 543 0012 00 used
      emerson comfort alert diagnostics 543 0012 00 used
      Opens in a new window or tab
      Pre-Owned
      $45.99
      or Best Offer
      +$10.50 delivery in 2-4 days
      Sponsored
      qualityheatingandcooling (2,776) 100%
    • EMERSON COMFORT ALERT ULTRATECH DIAGNOSTICS 543-0032-00 HVAC
      EMERSON COMFORT ALERT ULTRATECH DIAGNOSTICS 543-0032-00 HVAC
      Opens in a new window or tab
      Pre-Owned
      $30.00
      Buy It Now
      Free delivery
      Sponsored
      lucky-13 (648) 100%
    • EMERSON COMFORT ALERT ULTRA TECH DIAGNOSTICS 543-0033-02  (6857) C3 CP
      EMERSON COMFORT ALERT ULTRA TECH DIAGNOSTICS 543-0033-02 (6857) C3 CP
      Opens in a new window or tab
      Pre-Owned
      5.0 out of 5 stars.
      1 product rating - EMERSON COMFORT ALERT ULTRA TECH DIAGNOSTICS 543-0033-02 (6857) C3 CP
      $4.99
      0 bids · Time left2d 17h left (Thu, 12:32 PM)
      or Best Offer
      +$6.15 delivery
      Sponsored
      james4845 (72) 100%
    • Emerson Comfort Alert Diagnostics (943-0038-02)- USED ONCE
      Emerson Comfort Alert Diagnostics (943-0038-02)- USED ONCE
      Opens in a new window or tab
      Pre-Owned
      $79.99
      or Best Offer
      +$5.99 delivery
      Sponsored
      bsan1989 (189) 100%
    • Emerson 543-0038-02 comfort alert commercial diagnostics
      Emerson 543-0038-02 comfort alert commercial diagnostics
      Opens in a new window or tab
      Pre-Owned
      $124.61
      or Best Offer
      Free delivery
      from India
      Free returns
      Sponsored
      Top Rated Plus
      • Sellers with highest buyer ratings
      • Returns, money back
      • Ships in a business day with tracking
      Learn More
      Top Rated Plus
      aeliya110 (2,276) 98.1%
    • EMERSON COMFORT ALERT ULTRATECH DIAGNOSTICS 543-0033-00 HVAC
      EMERSON COMFORT ALERT ULTRATECH DIAGNOSTICS 543-0033-00 HVAC
      Opens in a new window or tab
      Pre-Owned
      $33.95
      or Best Offer
      Free delivery
      Sponsored
      darwil-eix573 (6,598) 98%
    • Emerson Comfort Alert Diagnostics 543-0012-00
      Emerson Comfort Alert Diagnostics 543-0012-00
      Opens in a new window or tab
      Pre-Owned
      $25.00
      Buy It Now
      Free delivery
      Sponsored
      wildbill12000 (1,428) 100%
    • Emerson Comfort Alert Diagnostics 543-0012-00
      Emerson Comfort Alert Diagnostics 543-0012-00
      Opens in a new window or tab
      Pre-Owned
      $19.98
      or Best Offer
      +$15.88 delivery
      Last one
      Sponsored
      rescientific (860) 100%
    • EMERSON Comfort Alert Diagnostics 543-0010-00
      EMERSON Comfort Alert Diagnostics 543-0010-00
      Opens in a new window or tab
      Pre-Owned
      $29.99
      Buy It Now
      Free delivery
      Sponsored
      cobren (354) 100%
    • Emerson Comfort Alert Diagnostics 543-0012-00
      Emerson Comfort Alert Diagnostics 543-0012-00
      Opens in a new window or tab
      Pre-Owned
      $25.00
      Buy It Now
      +$4.99 delivery
      Sponsored
      alha_2302 (1,718) 96.9%
    • Emerson Climate Technologies Comfort Alert  Ultra Tech Diagnostics 543-0033-02
      Emerson Climate Technologies Comfort Alert Ultra Tech Diagnostics 543-0033-02
      Opens in a new window or tab
      Pre-Owned
      $35.00
      Buy It Now
      +$5.00 delivery
      Free returns
      Last one
      Sponsored
      thriftydave423 (995) 100%
    • Emerson Comfort Alert Diagnostics 543-0012-00
      Emerson Comfort Alert Diagnostics 543-0012-00
      Opens in a new window or tab
      Pre-Owned
      $79.95
      Buy It Now
      +$4.95 delivery
      Last one
      Sponsored
      baumgjerem (3,745) 98.1%
    • EMERSON COMFORT ALERT ULTRATECH DIAGNOSTICS 543-0033-02 HVAC
      EMERSON COMFORT ALERT ULTRATECH DIAGNOSTICS 543-0033-02 HVAC
      Opens in a new window or tab
      Pre-Owned
      $30.00
      Buy It Now
      Free delivery
      Sponsored
      lucky-13 (648) 100%
    • Emerson Comfort Alert UltraTech Diagnostics 543-0033-02 🔥 Used Checked
      Emerson Comfort Alert UltraTech Diagnostics 543-0033-02 🔥 Used Checked
      Opens in a new window or tab
      Pre-Owned
      5.0 out of 5 stars.
      1 product rating - Emerson Comfort Alert UltraTech Diagnostics 543-0033-02 🔥 Used Checked
      $29.99
      Buy It Now
      Free delivery
      Sponsored
      ohiomusic1 (6,102) 100%
    • USED EMERSON COMFORT ALERT ULTRATECH DIAGNOSTICS 543-0038-02 HVAC
      USED EMERSON COMFORT ALERT ULTRATECH DIAGNOSTICS 543-0038-02 HVAC
      Opens in a new window or tab
      Pre-Owned
      $49.99
      or Best Offer
      +$6.22 delivery
      Sponsored
      nwpaplc (36) 100%
    • EMERSON COMFORT ALERT ULTRATECH DIAGNOSTICS 543-0033-02 HVAC
      EMERSON COMFORT ALERT ULTRATECH DIAGNOSTICS 543-0033-02 HVAC
      Opens in a new window or tab
      Pre-Owned
      $34.99
      or Best Offer
      Free delivery
      Sponsored
      rescientific (860) 100%
    • EMERSON COMFORT ALERT DIAGNOSTICS 24V 50/60HZ FREE SHIPPING
      EMERSON COMFORT ALERT DIAGNOSTICS 24V 50/60HZ FREE SHIPPING
      Opens in a new window or tab
      New – Open box
      $29.99
      or Best Offer
      Free delivery
      Sponsored
      traderman35 (10,238) 100%
    • EMERSON COMFORT ALERT ULTRATECH DIAGNOSTICS 543-0033-00 HVAC
      EMERSON COMFORT ALERT ULTRATECH DIAGNOSTICS 543-0033-00 HVAC
      Opens in a new window or tab
      Pre-Owned
      $35.00
      Buy It Now
      Free delivery
      Sponsored
      lucky-13 (648) 100%
    • EMERSON COMFORT ALERT ULTRATECH DIAGNOSTICS 543-0033-00 HVAC
      EMERSON COMFORT ALERT ULTRATECH DIAGNOSTICS 543-0033-00 HVAC
      Opens in a new window or tab
      Pre-Owned
      $30.00
      or Best Offer
      +$6.20 delivery
      Sponsored
      jast7235 (8) 0%
    • Emerson Comfort Alert Ultratech Diagnostics 543-0033-02
      Emerson Comfort Alert Ultratech Diagnostics 543-0033-02
      Opens in a new window or tab
      Pre-Owned
      $25.00
      or Best Offer
      Free delivery
      Sponsored
      nsil1969 (279) 100%
    • Emerson Comfort Alert Ultratech Diagnostics 543-0033-02
      Emerson Comfort Alert Ultratech Diagnostics 543-0033-02
      Opens in a new window or tab
      Pre-Owned
      5.0 out of 5 stars.
      1 product rating - Emerson Comfort Alert Ultratech Diagnostics 543-0033-02
      $20.00
      Buy It Now
      +$10.00 delivery
      Sponsored
      techman44 (139) 98%
    • EMERSON COMFORT ALERT ULTRATECH DIAGNOSTICS 543-0033-00 HVAC
      EMERSON COMFORT ALERT ULTRATECH DIAGNOSTICS 543-0033-00 HVAC
      Opens in a new window or tab
      Pre-Owned
      $24.99
      or Best Offer
      +$15.00 delivery in 2-4 days
      Sponsored
      qualityheatingandcooling (2,776) 100%
    • EMERSON COMFORT ALERT ULTRA TECH DIAGNOSTICS 543-0033-01  (3929) E3 CP
      EMERSON COMFORT ALERT ULTRA TECH DIAGNOSTICS 543-0033-01 (3929) E3 CP
      Opens in a new window or tab
      Pre-Owned
      5.0 out of 5 stars.
      2 product ratings - EMERSON COMFORT ALERT ULTRA TECH DIAGNOSTICS 543-0033-01 (3929) E3 CP
      $39.99
      or Best Offer
      Free delivery
      Sponsored
      acray1234 (2,822) 100%
    • Results matching fewer words

    • EMERSON Comfort Alert Ultra Tech Diagnostics 543-0010-00
      EMERSON Comfort Alert Ultra Tech Diagnostics 543-0010-00
      Opens in a new window or tab
      Pre-Owned
      $14.28
      or Best Offer
      +$5.86 delivery
      from Canada
      Sponsored
      hvac_motors_and_parts (546) 100%
    • EMERSON Comfort Alert Diagnostics Key Module 543-0010-01
      EMERSON Comfort Alert Diagnostics Key Module 543-0010-01
      Opens in a new window or tab
      Pre-Owned
      $40.00
      Buy It Now
      Free delivery
      3 watchers
      Sponsored
      netsellerzoc (46,851) 99.9%
    • EMERSON Comfort Alert Ultra Tech Diagnostics 543-0010-01
      EMERSON Comfort Alert Ultra Tech Diagnostics 543-0010-01
      Opens in a new window or tab
      Pre-Owned
      1.0 out of 5 stars.
      1 product rating - EMERSON Comfort Alert Ultra Tech Diagnostics 543-0010-01
      $14.28
      or Best Offer
      +$12.94 delivery
      from Canada
      Sponsored
      hvac_motors_and_parts (546) 100%
    • Emerson Climate Technologies Comfort Alert Ultra-tech Diagnostics 543-0069-00
      Emerson Climate Technologies Comfort Alert Ultra-tech Diagnostics 543-0069-00
      Opens in a new window or tab
      Pre-Owned
      $56.55
      or Best Offer
      Free delivery
      from Canada
      Sponsored
      big-dog-hvac (24) 92%
    • OEM EMERSON COMFORT ALERT 543-0012-00 CONTROL BOARD HVAC USA 🇺🇸 SELLER FREE...
      OEM EMERSON COMFORT ALERT 543-0012-00 CONTROL BOARD HVAC USA 🇺🇸 SELLER FREE...
      Opens in a new window or tab
      Pre-Owned
      $17.95
      or Best Offer
      Free delivery
      Sponsored
      smsrj-37 (411) 97.3%
    • Emerson Comfort Alert Diagnostics Key 543-0010-01
      Emerson Comfort Alert Diagnostics Key 543-0010-01
      Opens in a new window or tab
      Pre-Owned
      $15.00
      Buy It Now
      +$5.00 delivery
      Sponsored
      techman44 (139) 98%
    • EMERSON Comfort Alert Diagnostics Key Module 543-0010-01
      EMERSON Comfort Alert Diagnostics Key Module 543-0010-01
      Opens in a new window or tab
      Pre-Owned
      $45.00
      Buy It Now
      Free delivery
      Free returns
      Sponsored
      Top Rated Plus
      • Sellers with highest buyer ratings
      • Returns, money back
      • Ships in a business day with tracking
      Learn More
      Top Rated Plus
      bhmuddracer (1,901) 100%
    • Emerson 543-0038-02 Comfort Alert Diagnostics 943-0038-02 0735
      Emerson 543-0038-02 Comfort Alert Diagnostics 943-0038-02 0735
      Opens in a new window or tab
      Pre-Owned
      $125.00
      or Best Offer
      Free delivery
      from India
      Free returns
      Sponsored
      marine.vintage (1,461) 99%
    • Emerson Comfort Alert Diagnostics Key 543-0033-02
      Emerson Comfort Alert Diagnostics Key 543-0033-02
      Opens in a new window or tab
      Pre-Owned
      $19.99
      or Best Offer
      Free delivery
      Sponsored
      cheap-hvac-parts (54) 96.6%
    • Emerson Comfort Alert 543-0010-00 Furnace Fault Finder Diagnostics Module Used ♧
      Emerson Comfort Alert 543-0010-00 Furnace Fault Finder Diagnostics Module Used ♧
      Opens in a new window or tab
      Pre-Owned
      5.0 out of 5 stars.
      1 product rating - Emerson Comfort Alert 543-0010-00 Furnace Fault Finder Diagnostics Module Used ♧
      $67.97
      Buy It Now
      +$3.95 delivery
      Sponsored
      baumgjerem (3,745) 98.1%
    • EMERSON 543-0032-00 COMFORT ALERT DIAGNOSTICS MODULE Copeland Scroll
      EMERSON 543-0032-00 COMFORT ALERT DIAGNOSTICS MODULE Copeland Scroll
      Opens in a new window or tab
      Pre-Owned
      $19.98
      Buy It Now
      Free delivery
      Sponsored
      wathenent0 (103) 98.4%
    • Furnace Control Board Emerson Comfort Alert Diagnostics P/N 543-0032-00 #AS3
      Furnace Control Board Emerson Comfort Alert Diagnostics P/N 543-0032-00 #AS3
      Opens in a new window or tab
      Pre-Owned
      $32.00
      or Best Offer
      Free delivery
      Sponsored
      mrkaifabek (1,102) 99.7%
    • EMERSON COMFORT ALERT DIAGNOSTICS 543-0012-00  (7567) C1 CP
      EMERSON COMFORT ALERT DIAGNOSTICS 543-0012-00 (7567) C1 CP
      Opens in a new window or tab
      Pre-Owned
      $36.00
      or Best Offer
      Free delivery
      Sponsored
      rewindrelics_7 (394) 100%
    • Emerson Climate Technologies Comfort Alert Diagnostics Key P/N 543-0032-00
      Emerson Climate Technologies Comfort Alert Diagnostics Key P/N 543-0032-00
      Opens in a new window or tab
      Pre-Owned
      $18.00
      or Best Offer
      +$6.90 delivery
      Sponsored
      deben_6519 (201) 100%
    • Furnace Control Board Emerson Comfort Alert Diagnostics P/N 543-0032-00
      Furnace Control Board Emerson Comfort Alert Diagnostics P/N 543-0032-00
      Opens in a new window or tab
      Pre-Owned
      $17.86
      or Best Offer
      +$12.94 delivery
      from Canada
      Sponsored
      hvac_motors_and_parts (546) 100%
    • Emerson Climate Technologies Comfort Alert Commercial Diagnostics. 543-0033
      Emerson Climate Technologies Comfort Alert Commercial Diagnostics. 543-0033
      Opens in a new window or tab
      Refurbished
      $39.99
      Buy It Now
      Free delivery
      Sponsored
      jcbrink15 (712) 100%
    • OEM EMERSON COMFORT ALERT 543-0032-00 HVAC
      OEM EMERSON COMFORT ALERT 543-0032-00 HVAC
      Opens in a new window or tab
      Pre-Owned
      1.0 out of 5 stars.
      1 product rating - OEM EMERSON COMFORT ALERT 543-0032-00 HVAC
      $49.95
      Buy It Now
      +$3.95 delivery
      Sponsored
      baumgjerem (3,745) 98.1%
    • Emerson 543-0032-00 Comfort Alert Diagnostics Key Copeland Compressors
      Emerson 543-0032-00 Comfort Alert Diagnostics Key Copeland Compressors
      Opens in a new window or tab
      Pre-Owned
      $45.94
      Buy It Now
      +$39.37 delivery
      from Canada
      Sponsored
      johnsuniversalparts (326) 100%
    • Tell us what you think- opens in new window or tab

    • About eBay
    • Announcements
    • Community
    • Security Center
    • Seller Center
    • Policies
    • Affiliates
    • Help & Contact
    • Site Map
    Copyright © 1995-2025 eBay Inc. All Rights Reserved. Accessibility, User Agreement, Privacy, Consumer Health Data, Payments Terms of Use, Cookies, CA Privacy Notice, Your Privacy Choices and AdChoice
    Copyright © 1995-2025 eBay Inc. All Rights Reserved. Accessibility, User Agreement, Privacy, Consumer Health Data, Payments Terms of Use, Cookies, CA Privacy Notice, Your Privacy Choices and AdChoice