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TDC Power Transformer DA 20 24 Input 120VAC Output 24VAC 083A 20VA FREE SHIP
$24.99
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GE 453XT1AJ2E 75VA CONTROL TRANSFORMERS 120 24 VAC
$17.50
Time Remaining: 9d 17h 23m
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HoneyWell AT72 D 1683 Control Circuit Transformer Pri 120VAC Sec 24VAC NEW
$18.95
Time Remaining: 26d 7h 4m
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Transformer HCT 01E0BB06 Pri 120VAC Sec 24VAC 40VA
$16.00
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Tyco Electronics Control Transformer Box Of 10 120VAC to 24VAC 50VA 50 60Hz
$100.00
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NEW Tyco Transformer PRI 240V SEC 24VAC 50 60HZ 30VA 4000 02M04K109 63005 002
$19.99
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Power Transformer 117VAC 24VAC Center Tap 12 0 12 3A 28N091
$18.95
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New MG Electronics 24 VAC Class 2 Power Transformer 40 VA With LED MGT2440
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New MG Electronics 24VAC Class 2 Transformer Model MGT2450
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Honeywell XFMR AT175F1023 PRI 120 208 240V SEC 24VAC Listed Class 2 Tranformer
$29.75
Time Remaining: 29d 13h 26m
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120V 24V Transformer 120VAC 24VAC 125A 57LEIB24125 Rain Bird ESP 4M
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24VCT 24V 12V Transformer 12V 0 12V CT 3A 110Vac 220Vac to 24Vac 12Vac free shi
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Power Supply 60320 01 Input 120VAC 220mA Output 24VAC 144VA
$14.99
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Honeywell Universal Transformer AT140A 1018 24 VAC 40 VA120 208 240 Volt
$21.96
Time Remaining: 24d 5h 49m
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MG Electronics 24VAC Class 2 Transformer Model MGT2450
$19.00
Time Remaining: 4d 3h 27m
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Tyco 4000 13E07K662 Transformer 5 1611455 7 40VA 24 VAC
$16.99
Time Remaining: 6d 8h 26m
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Universal Transformer 24VAC 40VA 48W UB2440W Class 2 Transformer UL Listed
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Time Remaining: 28d 17h 21m
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SQUARE D 9070T200D13 Transformer200VA120VAC To 12 24VAC
$175.82
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Power Supply Sino American A42410CG Input 120VAC 35W Output 24VAC 800mA
$14.99
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Power Transformer 117VAC 24VAC Center Tap 12 0 12 5A 28N073
$23.95
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Power Supply P N 654 0111 0031A Input 120 VAC 45W Output 24VAC 15A
$14.99
Time Remaining: 5d 18h 11m
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Power Supply Model 13967CT Input 120 VAC 270mA Output 24VAC 1000mA
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NEW 0250 KVA GENERAL ELECTRIC BUCK BOOST TRANSFORMER 12 24 VAC MODEL 9T51B107
$179.99
Time Remaining: 29d 17h 14m
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Power Supply 338 1056 T0020 Input 120VAC 02A Output 24 VAC 16VA
$13.99
Time Remaining: 5d 18h 11m
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ACME ELECTRIC TBGR81325 Control Transformer In 240 480VAC Out 24VAC 250VA NEW
$100.00
Time Remaining: 15d 7h 44m
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Functional Devices Inc RIB TR100VA001 Class 2 Transformer 24VAC 100 VA 1 PH
$33.00
Time Remaining: 29d 6h 46m
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Tyco Electronics PRI 277VAC 40VA 50 60Hz SEC 24VAC Transformer 1091226
$19.99
Time Remaining: 23d 6h 9m
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SIGNAL TRANSFORMER A41 130 24 115 230 VAC 12 24 VAC 130VA A3M
$24.95
Time Remaining: 17d 16h 42m
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Power Supply Paradyne 654 0098 0031 120VAC 21W Output 24VAC 650mA
$14.99
Time Remaining: 5d 18h 11m
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Core Components 120 024 050 TF CB 120v PRI 24vac 50va transformer NIB IA
$15.00
Time Remaining: 1d 14h 45m
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New Altronix 24VAC Open Frame Transformer T24175
$49.99
Time Remaining: 26d 23h 17m
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Johnson 40va transformer 24VAC primary foot mounting
$18.25
Time Remaining: 13d 18h 48m
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SQUARE D 9070TF50D13 Transformer50VA120VAC To 12 24VAC
$183.44
Time Remaining: 17d 18h 52m
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Honeywell AT140A 1000 Transformer Class 2 24 VAC 40 VA 120 V 60 HZ FREE SHIP
$22.73
Time Remaining: 17d 8h 41m
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SQUARE D 9070T500D2 TRANSFORMER 500VA 240 480VAC to 24VAC 1YUR8
$100.00
Time Remaining: 13d 4h 57m
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NEW 50 VA HARTLAND CONTROLS PE 10 5105 277 VAC 24 VAC CONTROL TRANSFORMER
$24.88
Time Remaining: 16h 56m
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LOT OF 2 NEW HONEYWELL AT72D1683 TRANSFORMER 120V PRIMARY 24 VAC SECONDARY 40VA
$45.00
Time Remaining: 2d 12h 14m
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Hartland Controls HCT60D0BB06 24vac 50va transformer new Bulk IA
$20.00
Time Remaining: 1d 14h 47m
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Core Components CPS 120 24 100U Transformer Power Supply 120VAC 24VAC New
$49.95
Time Remaining: 23d 8h 38m
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Core Components 120 024 075 1TF CB 120v PRI 24vac 75va transformer NIB IA
$25.00
Time Remaining: 1d 14h 45m
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Dongan 33 170 145 Industrial Control Transformer 170kVA 120 24VAC New
$39.95
Time Remaining: 18d 8h 7m
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Basler BE116440CAA 120V 60HZ 48A 24VAC 40VA plug in transformer power supply
$19.67
Time Remaining: 14d 5h 23m
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Functional Devices RIB PSMN24DA Power Supply 24Vac Input Adjustable DC output
$15.00
Time Remaining: 20h 7m
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Lee Model 598 Transformer New Old Stock 120v input 8 24vac output
$23.99
Time Remaining: 8d 10h 54m
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VINTAGE BASLER TRANSFORMER 24VAC 30VA BE116430AAA USED
$14.99
Time Remaining: 6d 14h 24m
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Honeywell Transformers AT140B1016 PRI 3 120V SEC 4 5 24VAC 50 60HZ 40VA
$24.99
Time Remaining: 10d 12h 51m
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HESHAN YINYU Model 28 Transformer 120 VAC input 24VAC out for Mini Neoflex
$19.99
Time Remaining: 7d 14h 15m
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Jard magnetic 4031M Fan Control Center 120 VAC Primary 24 VAC SPDT Relay NEW
$20.00
Time Remaining: 7d 16h 44m
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24VAC 2500MA Power Supply Input 120VAC 60Hz 600ma Output 24VAC 2500mA
$24.99
Time Remaining: 14d 7h 9m
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Class 2 Transformer 24VAC Output 40 VA 1PH 120 208 240VAC Input 4031PT
$39.13
Time Remaining: 25d 14h 20m
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NEW Tyco Transformer PRI 208 240 SEC 24VAC 50VA 50 60Hz 24L5301 4000Y09AW18K08
$19.99
Time Remaining: 25d 12h 34m
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Transformer AC Power Supply 24 VAC center tapped
$25.00
Time Remaining: 8d 17h 11m
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NEW Lenox 42J32 Transformer 120VAC SEC 24 VAC 40VA
$19.99
Time Remaining: 9d 7h 27m
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2 HONEYWELL AT72D1683 TRANSFORMER 120V PRIMARY 24VAC SECONDARY 40VA
$39.90
Time Remaining: 10d 18h 21m
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USED COM 4000 04E07BB132 TRANSFORMER PRI 480 VAC SEC 24VAC 40VA 0702G CLASS 2
$19.99
Time Remaining: 2d 18h 19m
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SIEMENS MT0050B TRANSFORMER PRIM 240 480VAC SEC 24VAC 50VA FUSED LNC
$19.99
Time Remaining: 7d 9h 9m
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Hulda 101551028010 Transformer 115VDC to 24VAC 75VA
$20.00
Time Remaining: 24d 7h 39m
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Transformer 120 208 240 480V X 24VAC 75VA WITH CIRCUIT BREAKER FOOT MOUNT
$49.95
Time Remaining: 16d 6h 54m
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MARS 50321 POWER TRANSFORMER 120 208 240 480 VOLT 24 VAC 75VA REPLACES 7541C
$39.95
Time Remaining: 21d 11h 38m
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Dormeyer DCT 40 120 Foot or 1 2 NPT Hub 120VAC 24VAC Transformer 40VA New
$18.00
Time Remaining: 22d 9h 18m
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4031PT POWER TRANSFORMER 120 208 240 VOLT 24 VAC 40VA
$59.95
Time Remaining: 22d 19h 11m
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Lot of 2 Basler Electric 200 230 VAC Primary 24 VAC Secondary Transformer 75VA
$35.00
Time Remaining: 24d 7h 36m
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CUTLER HAMMER C0075E1B INDUSTRIAL CONTROL TRANSFORMER PRI 120 240 SEC 24VAC
$45.00
Time Remaining: 8h 24m
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My thermostat for my heating and air just completely went blank. It's digital any ideas why?

It depends is your t-stat battery powered if it is change the batteries, if not it is powered by a 24vac transformer, and it could have went bad, or the t-stat is dead.

Also a wire could have came loose either the red 24vac power wire to the transformer or the common black wire.

Also the 3 amp fuse on the furnaces control board may have blown for some reason.

You need a volt meter and start checking around but if you don't know how to use it, you had better call in the professionals.

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