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24VAC 40VA Plug In Class 2 Transformer UL Listed AM 241660A
$19.95
Time Remaining: 11d 18h 40m
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Honeywell AT72D1683 Multi Mount Control Circuit Transformer 120V 24VAC 40VA
$20.00
Time Remaining: 29d 20h 55m
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MG Electronics 24VAC Class 2 Transformer Model MGT2450
$19.00
Time Remaining: 7d 14h 49m
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Power Transformer 117VAC 24VAC Center Tap 12 0 12 3A 28N091
$18.95
Time Remaining: 5d 18h 13m
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New Altronix 24VAC Open Frame Transformer T24175
$59.99
Time Remaining: 29d 20h 7m
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2 Tyco Transformer PRI 120V SEC 24VAC 50 60HZ 40VA 4000 01V18G386 E0086100
$15.00
Time Remaining: 24d 19h 21m
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24vac transformer 50va 120vac to 24vac New Surplus 24volt
$15.00
Time Remaining: 12d 21h 22m
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Tyco Transformer PRI 480V SEC 24VAC 50 60Hz 75VA
$17.81
Time Remaining: 4d 11h 54m
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Transformer HCT 01E0BB06 Pri 120VAC Sec 24VAC 40VA
$16.00
Time Remaining: 17d 13h
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HoneyWell AT72 D 1683 Control Circuit Transformer Pri 120VAC Sec 24VAC NEW
$18.95
Time Remaining: 29d 3h 53m
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TYCO 4600 213C02AB48 TRANSFORMER 230V 265VAC 20VA OUT 24VAC CLASS 2
$20.00
Time Remaining: 9d 14h 27m
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Class 2 Transformer Input 120 208 240VAC Output 24VAC 50 VA 1 PH 620 502
$18.27
Time Remaining: 16d 15h 12m
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DSC PTC2440U Plug In Transformer 24VAC 40VA
$15.00
Time Remaining: 25d 18h 40m
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NEW Lenox 42J32 Transformer 120VAC SEC 24 VAC 40VA
$19.99
Time Remaining: 13d 11h 38m
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2 Tyco Transformers PRI 120V SEC 24VAC 50 60HZ 40VA 4000 01V18G386 E0086100
$17.95
Time Remaining: 27d 44m
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24VCT 24V 12V Transformer 12V 0 12V CT 3A 110Vac 220Vac to 24Vac 12Vac free shi
$19.95
Time Remaining: 18d 10h 49m
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Trane 120 to 24 VAC Transformer 40VA NEW
$15.00
Time Remaining: 2d 13h 12m
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Tyco Electronics PRI 277VAC 40VA 50 60Hz SEC 24VAC Transformer 1091226
$19.99
Time Remaining: 27d 10h 19m
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NEW Tyco Transformer PRI 240V SEC 24VAC 50 60HZ 30VA 4000 02M04K109 63005 002
$19.99
Time Remaining: 10h 14m
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ACME TRANSFORMER T 1 81048 100VA 1PH 120 240V AC 12 24V AC TRANSFORMER D468143
$23.00
Time Remaining: 27d 11h 42m
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Control Stepdown TRANSFORMER 120V 240V x 24VAC CTO350 K00 350VA
$45.00
Time Remaining: 4d 11h 25m
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Gti 24Vac Transformer step down 120v to 24vac open frame
$24.00
Time Remaining: 2d 10h 59m
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NEW RIB TR100VA001US Power Transformer 120V Input 24VAC Out 100VA FREE SHIPPING
$38.29
Time Remaining: 19d 17h 43m
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Power Transformer 117VAC 24VAC Center Tap 12 0 12 5A 28N073
$23.95
Time Remaining: 5d 16h 33m
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MICRON J100A1EA1A01 EP 100VA 1PH 120 240V AC 12 24V AC TRANSFORMER D468275
$45.00
Time Remaining: 29d 15h 30m
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TDC Power Transformer DA 20 24 Input 120VAC Output 24VAC 083A 20VA FREE SHIP
$20.99
Time Remaining: 5d 17h 38m
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NEW GE 9T51B107 250VA 1PH 120 240V AC 12 24V AC TRANSFORMER D398176
$75.00
Time Remaining: 2d 22h 34m
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Tyco Electronics Control Transformer Box Of 10 120VAC to 24VAC 50VA 50 60Hz
$100.00
Time Remaining: 6d 16h 1m
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Tyco Electronics PRI 208 230VAC 43VA 50 60Hz SEC 24VAC Transformer 21J2101
$19.99
Time Remaining: 29d 14h 45m
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PACKARD 120 208 240V CLASS 2 TRANSFORMER 24VAC 40VA NEW BOXED
$26.50
Time Remaining: 29d 7h 26m
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Revere RT2440 RT 2440 UL Plug in Transformer 24 VAC 40 VA NEW IN BOX
$26.95
Time Remaining: 25d 14h 13m
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NEW GE 9T51B107 250VA 1PH 120 240V AC 12 24V AC TRANSFORMER D398176
$75.00
Time Remaining: 2d 12h
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Dongan 33 170 145 Industrial Control Transformer 170kVA 120 24VAC New
$39.95
Time Remaining: 22d 12h 17m
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120 240 to 24 VAC 250 VA 105 C Control Transformer ImperviTRAN Micron B250LP7JX
$35.00
Time Remaining: 6d 17h 41m
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ACME T 1 81048 GENERAL PURPOSE 120 240V AC 12 24V AC VOLTAGE TRANSFORMER B430616
$23.00
Time Remaining: 4d 9h 41m
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MARS 50321 POWER TRANSFORMER 120 208 240 480 VOLT 24 VAC 75VA REPLACES 7541C
$39.95
Time Remaining: 25d 15h 49m
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Dormeyer DCT 40 120 Foot or 1 2 NPT Hub 120VAC 24VAC Transformer 40VA New
$18.00
Time Remaining: 26d 13h 28m
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Basler BE116440CAA 120V 60HZ 48A 24VAC 40VA plug in transformer power supply
$19.43
Time Remaining: 18d 8h 28m
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Core Components CPS 120 24 100U Transformer Power Supply 120VAC 24VAC New
$49.95
Time Remaining: 27d 12h 49m
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ServiceFirst 24VAC 75VA Transformer 120 208 240 480 TRR00475 X13550226147 24V
$49.28
Time Remaining: 26d 1h 38m
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Toroidal Core Transformer 250 VA 120 VAC 24 VAC KIS KLS
$18.00
Time Remaining: 5d 16h 54m
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Tyco 4000 13E07K662 Transformer 5 1611455 7 40VA 24 VAC
$16.99
Time Remaining: 10d 12h 37m
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NEW 50 VA HARTLAND CONTROLS PE 10 5105 277 VAC 24 VAC CONTROL TRANSFORMER
$24.88
Time Remaining: 4d 21h 6m
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Amseco Class 2 Transformer 40VA 24VAC XT 2440 lot of 4
$50.00
Time Remaining: 3d 14h 32m
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ALTRONIX T24130D Class 2 Transformer24VAC100 VA G7483481
$29.01
Time Remaining: 23d 12h 30m
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New Sloan Optima Transformer EL 154 120 vac 24 vac 50 va
$16.99
Time Remaining: 16d 15h 56m
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MARS CONTROL 50327 Transformer 24VAC
$24.99
Time Remaining: 20d 17h 19m
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Core Components 120 024 050 TF CB 120v PRI 24vac 50va transformer NIB IA
$15.00
Time Remaining: 5d 18h 55m
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HONEYWELL AT72D 1691 MULTI MOUNT CONTROL CIRCUIT TRANSFORMER 40 VA 24 VAC NEW
$30.00
Time Remaining: 14d 13h 47m
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FUNCTIONAL DEVICES RIB TR50VA004 TRANSFORMER 120 240 277 480 to 24vac
$24.99
Time Remaining: 18d 17h 55m
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NIB PASS SEYMOUR 1039 TRANSFORMER 75 VA 277 VAC 24 VAC 312 AMP
$49.90
Time Remaining: 12d 23h 25m
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CUTLER HAMMER C0075E1B INDUSTRIAL CONTROL TRANSFORMER PRI 120 240 SEC 24VAC
$45.00
Time Remaining: 4d 12h 34m
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NEW Tyco Transformer PRI 208 240 SEC 24VAC 50VA 50 60Hz 24L5301 4000Y09AW18K08
$19.99
Time Remaining: 29d 16h 45m
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Lot of 2 Sloan Optima EL154 120 VAC 24 VAC 50 VA Transformer
$29.00
Time Remaining: 24d 17h 27m
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Lee Model 598 Transformer New Old Stock 120v input 8 24vac output
$23.99
Time Remaining: 12d 15h 4m
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93132 Old Stock Honeywell 198162F Cover Assembly w Transformer 24Vac 40VA
$33.99
Time Remaining: 28d 13h 9m
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USED COM 4000 04E07BB132 TRANSFORMER PRI 480 VAC SEC 24VAC 40VA 0702G CLASS 2
$19.99
Time Remaining: 6d 22h 30m
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SAMSUNG OBJY2 P 313 115V AC 24V AC VOLTAGE TRANSFORMER B467459
$21.00
Time Remaining: 24d 8h 10m
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MARCUS MC1KT 1KVA 1PH 120 240V AC 12 24V AC VOLTAGE TRANSFORMER B377560
$80.00
Time Remaining: 26d 16h 50m
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REVERE RT2420 UL PLUG IN TRANSFORMER 24VAC 20VA
$17.10
Time Remaining: 17d 15h 2m
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Functional Devices TR50VA014 Class 2 Transformer 24VAC 50VA 1 Phase Off6A
$17.99
Time Remaining: 4d 17h 26m
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Beacon TFM4031 120 208 240V CLASS 2 TRANSFORMER 24VAC 40VA NEW BOXED
$19.99
Time Remaining: 21d 13h 10m
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Hammond Manufacturing 25 VA Single Phase Control Transformer 120 VAC to 24 VAC
$15.00
Time Remaining: 17d 15h 45m
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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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