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24VAC 40VA Plug In Class 2 Transformer UL Listed AM 241660A
$19.95
Time Remaining: 3d 9h 48m
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MG Electronics 24VAC Class 2 Transformer Model MGT2450
$19.00
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120V 24V Transformer 120VAC 24VAC 125A 57LEIB24125 Irritrol Rain Dial RD 600
$19.98
Time Remaining: 4d 15h 7m
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24VAC 40VA Plug In Class 2 Transformer UL Listed AM 241660A
$19.99
Time Remaining: 22d 3h 29m
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HESHAN YINYU Model 28 Transformer 120 VAC input 24VAC out for Mini Neoflex
$19.99
Time Remaining: 3d 9h 33m
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4031PT Class 2 Transformer 120 208 240 VOLT 24 VAC 40VA Prepaid Shipping
$60.00
Time Remaining: 29d 15h 18m
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24VCT 24V 12V Transformer 12V 0 12V CT 3A 110Vac 220Vac to 24Vac 12Vac free shi
$19.95
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NEW HAMMOND MH100JG 100VA 120V AC 24V AC VOLTAGE TRANSFORMER B471850
$21.00
Time Remaining: 29d 23h 31m
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Power Transformer 117VAC 24VAC Center Tap 12 0 12 3A 28N091
$18.95
Time Remaining: 27d 9h 21m
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EDWARDS 998 VOLTAGE 50 60 CYCLE 30W 120V AC 24V AC TRANSFORMER B351000
$18.00
Time Remaining: 29d 11h 55m
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Core Components CPS 120 24 100U Transformer Power Supply 120VAC 24VAC New
$49.95
Time Remaining: 19d 3h 56m
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SAMSUNG OBJY2 P 313 115V AC 24V AC VOLTAGE TRANSFORMER B470850
$21.00
Time Remaining: 27d 23h 53m
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TYCO 4001 09J15K42 CLASS 2 VOLTAGE 75VA 208 240V AC 24V AC TRANSFORMER B300330
$17.00
Time Remaining: 28d 21h 30m
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Transformer HCT 01E0BB06 Pri 120VAC Sec 24VAC 40VA
$16.00
Time Remaining: 9d 4h 7m
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Class 2 Transformer Input 120 208 240VAC Output 24VAC 50 VA 1 PH 620 502
$18.27
Time Remaining: 8d 6h 19m
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TIERNEY 250 V A MACHINE TOOL 250VA 120V AC 24V AC VOLTAGE TRANSFORMER B469612
$50.00
Time Remaining: 23d 1h 4m
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TYCO 4600 213C02AB48 TRANSFORMER 230V 265VAC 20VA OUT 24VAC CLASS 2
$20.00
Time Remaining: 1d 5h 34m
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2 Tyco Transformer PRI 120V SEC 24VAC 50 60HZ 40VA 4000 01V18G386 E0086100
$19.95
Time Remaining: 16d 10h 28m
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Toroidal Core Transformer 250 VA 120 VAC 24 VAC KIS KLS
$18.00
Time Remaining: 8d 6h 2m
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120 240 to 24 VAC 250 VA 105 C Control Transformer ImperviTRAN Micron B250LP7JX
$35.00
Time Remaining: 28d 8h 48m
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Dongan 33 170 145 Industrial Control Transformer 170kVA 120 24VAC New
$39.95
Time Remaining: 14d 3h 25m
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NEW Tyco Transformer PRI 240V SEC 24VAC 50 60HZ 30VA 4000 02M04K109 63005 002
$19.99
Time Remaining: 22d 1h 22m
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Control Stepdown TRANSFORMER 120V 240V x 24VAC CTO350 K00 350VA
$45.00
Time Remaining: 26d 2h 40m
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HONEYWELL 14505206 001 100VA 120V AC 24V AC VOLTAGE TRANSFORMER B470736
$25.00
Time Remaining: 27d 6h 56m
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Signal Transformer 24 8 Transformer PRI 115 VAC SEC 6 12 18 24 VAC 192VA
$55.18
Time Remaining: 13d 8h 28m
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Lot of 2 Basler Electric 200 230 VAC Primary 24 VAC Secondary Transformer 75VA
$35.00
Time Remaining: 20d 2h 54m
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LOT OF 2 NEW HONEYWELL AT72D1683 TRANSFORMER 120V PRIMARY 24 VAC SECONDARY 40VA
$45.00
Time Remaining: 28d 7h 32m
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RIB PSH75A75AB10 Class 2 Transformer24VAC75 VA1 PH G5931536
$117.03
Time Remaining: 23d 17h 26m
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Power Transformer 117VAC 24VAC Center Tap 12 0 12 5A 28N073
$23.95
Time Remaining: 27d 7h 40m
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120V 24V Transformer 120VAC 24VAC 125A 57LEIB24125 Rain Bird ESP 4M
$19.99
Time Remaining: 7d 15h 7m
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DONGAN 50 0150 659 INDUSTRIAL CONTROL 1PH 575V AC 120 24V AC TRANSFORMER B430942
$20.00
Time Remaining: 26d 2h 6m
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Hammond Manufacturing 25 VA Single Phase Control Transformer 120 VAC to 24 VAC
$15.00
Time Remaining: 9d 6h 52m
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Tyco Transformer PRI 480V SEC 24VAC 50 60Hz 75VA
$21.99
Time Remaining: 26d 3h 3m
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DSC PTC2440U Plug In Transformer 24VAC 40VA
$15.00
Time Remaining: 17d 9h 48m
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Lot of 2 Sloan Optima EL154 120 VAC 24 VAC 50 VA Transformer
$29.00
Time Remaining: 16d 8h 34m
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RIB PSH75AB10 Class 2 Transformer24VAC75 VA1 PH G6018993
$73.29
Time Remaining: 23d 17h 51m
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NEW RIB TR100VA001US Power Transformer 120V Input 24VAC Out 100VA FREE SHIPPING
$38.29
Time Remaining: 11d 8h 51m
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Basler BE116440CAA 120V 60HZ 48A 24VAC 40VA plug in transformer power supply
$23.99
Time Remaining: 9d 23h 36m
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Gti 24Vac Transformer step down 120v to 24vac open frame
$23.00
Time Remaining: 1d 16h 48m
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HONEYWELL 14505206 001 VOLTAGE 120V AC 24V AC STEP DOWN TRANSFORMER B366208
$25.00
Time Remaining: 28d 3h 26m
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MARS CONTROL TRANSFORMER 24 VAC SECONDARY MODEL 50321
$59.99
Time Remaining: 14d 12h 9m
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NEW GE 9T51B107 250VA 1PH 120 240V AC 12 24V AC TRANSFORMER D398176
$75.00
Time Remaining: 24d 3h 7m
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Honeywell AT72D1683 Multi Mount Control Circuit Transformer 120V 24VAC 40VA
$20.00
Time Remaining: 21d 12h 3m
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NEW Lenox 42J32 Transformer 120VAC SEC 24 VAC 40VA
$19.99
Time Remaining: 5d 2h 45m
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PACKARD 120 208 240V CLASS 2 TRANSFORMER 24VAC 40VA NEW BOXED
$26.50
Time Remaining: 20d 22h 33m
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NEW 50 VA HARTLAND CONTROLS PE 10 5105 277 VAC 24 VAC CONTROL TRANSFORMER
$24.88
Time Remaining: 26d 12h 14m
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93132 Old Stock Honeywell 198162F Cover Assembly w Transformer 24Vac 40VA
$32.66
Time Remaining: 28d 16h 18m
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TDC Power Transformer DA 20 24 Input 120VAC Output 24VAC 083A 20VA FREE SHIP
$19.99
Time Remaining: 27d 12h 7m
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MARS 50321 POWER TRANSFORMER 120 208 240 480 VOLT 24 VAC 75VA REPLACES 7541C
$39.95
Time Remaining: 17d 6h 56m
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LIEBERT E 007B 75VA 460V AC 24V AC VOLTAGE TRANSFORMER LOT OF 3 NORLAKE ST 372
$45.00
Time Remaining: 17d 22h 5m
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HONEYWELL AT140B1206 40VA 1PH 120V AC 24V AC TRANSFORMER B470637
$20.00
Time Remaining: 27d 3h 4m
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NIB Johnson Controls Y65A13 0 40VA Transformer 120 VAC 24 VAC Foot Mounting
$22.00
Time Remaining: 26d 12h 43m
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STEP DOWN TRANSFORMERS 75VA 120 24VAC 60Hz 30T 5019 24V
$19.99
Time Remaining: 4d 1h 28m
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Lee Model 598 Transformer New Old Stock 120v input 8 24vac output
$23.99
Time Remaining: 4d 6h 12m
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MARCUS MC1KT 1KVA 1PH 120 240V AC 12 24V AC VOLTAGE TRANSFORMER B377560
$80.00
Time Remaining: 18d 7h 58m
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Dormeyer DCT 40 120 Foot or 1 2 NPT Hub 120VAC 24VAC Transformer 40VA New
$18.00
Time Remaining: 18d 4h 36m
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Tyco Electronics Control Transformer Box Of 10 120VAC to 24VAC 50VA 50 60Hz
$100.00
Time Remaining: 28d 7h 9m
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NEW GENERAL ELECTRIC REMOTE CONTROL TRANSFORMER 24 VAC MODEL RT 1 2 AVAILABLE
$129.99
Time Remaining: 3d 12h 12m
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USED COM 4000 04E07BB132 TRANSFORMER PRI 480 VAC SEC 24VAC 40VA 0702G CLASS 2
$19.99
Time Remaining: 28d 13h 37m
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Tyco Electronics PRI 277VAC 40VA 50 60Hz SEC 24VAC Transformer 1091226
$19.99
Time Remaining: 19d 1h 27m
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Amseco Class 2 Transformer 40VA 24VAC XT 2440 lot of 4
$50.00
Time Remaining: 25d 5h 40m
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GENERAL ELECTRIC GE 9T51B107 250VA 120 240V AC 12 24V AC TRANSFORMER D456692
$40.00
Time Remaining: 21d 2h 32m
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Transformer AC Power Supply 24 VAC center tapped
$25.00
Time Remaining: 4d 12h 29m
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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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