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24VAC 40VA Plug In Class 2 Transformer UL Listed AM 241660A
$19.95
Time Remaining: 10d 5h 3m
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2 Tyco Transformer PRI 120V SEC 24VAC 50 60HZ 40VA 4000 01V18G386 E0086100
$19.95
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Core Components CPS 120 24 100U Transformer Power Supply 120VAC 24VAC New
$49.95
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MG Electronics 24VAC Class 2 Transformer Model MGT2450
$19.00
Time Remaining: 6d 1h 12m
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2 Tyco Transformers PRI 120V SEC 24VAC 50 60HZ 40VA 4000 01V18G386 E0086100
$24.95
Time Remaining: 25d 11h 7m
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10 Tyco Transformers PRI 120V SEC 24VAC 50 60HZ 40VA 4000 01V18G386 E0086100
$95.00
Time Remaining: 29d 19h 59m
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Power Transformer 117VAC 24VAC Center Tap 12 0 12 3A 28N091
$18.95
Time Remaining: 4d 4h 36m
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Lot of 2 Basler Electric 200 230 VAC Primary 24 VAC Secondary Transformer 75VA
$35.00
Time Remaining: 26d 22h 10m
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24vac transformer 50va 120vac to 24vac New Surplus 24volt
$15.00
Time Remaining: 11d 7h 45m
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NEW GENERAL ELECTRIC REMOTE CONTROL TRANSFORMER 24 VAC MODEL RT 1 2 AVAILABLE
$129.99
Time Remaining: 10d 7h 28m
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24VAC 40VA Plug In Class 2 Transformer UL Listed AM 241660A
$19.99
Time Remaining: 28d 22h 45m
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Transformer HCT 01E0BB06 Pri 120VAC Sec 24VAC 40VA
$16.00
Time Remaining: 15d 23h 23m
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Tyco Transformer PRI 480V SEC 24VAC 50 60Hz 75VA
$21.99
Time Remaining: 2d 22h 17m
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DSC PTC2440U Plug In Transformer 24VAC 40VA
$15.00
Time Remaining: 24d 5h 3m
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NEW Lenox 42J32 Transformer 120VAC SEC 24 VAC 40VA
$19.99
Time Remaining: 11d 22h 1m
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Honeywell AT72D1683 Multi Mount Control Circuit Transformer 120V 24VAC 40VA
$20.00
Time Remaining: 28d 7h 18m
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Class 2 Transformer Input 120 208 240VAC Output 24VAC 50 VA 1 PH 620 502
$18.27
Time Remaining: 15d 1h 35m
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ACME TRANSFORMER T 1 81052 750VA 120 240V AC 24V AC VOLTAGE TRANSFORMER B469896
$50.00
Time Remaining: 29d 20h 57m
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TYCO 4600 213C02AB48 TRANSFORMER 230V 265VAC 20VA OUT 24VAC CLASS 2
$20.00
Time Remaining: 8d 50m
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TIERNEY 250 V A MACHINE TOOL 250VA 120V AC 24V AC VOLTAGE TRANSFORMER B469612
$50.00
Time Remaining: 29d 20h 20m
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USED COM 4000 04E07BB132 TRANSFORMER PRI 480 VAC SEC 24VAC 40VA 0702G CLASS 2
$19.99
Time Remaining: 5d 8h 53m
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24VCT 24V 12V Transformer 12V 0 12V CT 3A 110Vac 220Vac to 24Vac 12Vac free shi
$19.95
Time Remaining: 16d 21h 12m
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Trane 120 to 24 VAC Transformer 40VA NEW
$15.00
Time Remaining: 23h 35m
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Power Transformer 117VAC 24VAC Center Tap 12 0 12 5A 28N073
$23.95
Time Remaining: 4d 2h 56m
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Altronix T24130 24V AC output
$19.95
Time Remaining: 2d 5h 51m
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NEW Tyco Transformer PRI 240V SEC 24VAC 50 60HZ 30VA 4000 02M04K109 63005 002
$19.99
Time Remaining: 28d 20h 37m
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HoneyWell AT72 D 1683 Control Circuit Transformer Pri 120VAC Sec 24VAC NEW
$18.95
Time Remaining: 27d 14h 16m
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NEW RIB TR100VA001US Power Transformer 120V Input 24VAC Out 100VA FREE SHIPPING
$38.29
Time Remaining: 18d 4h 6m
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New Altronix 24VAC Open Frame Transformer T24175
$59.99
Time Remaining: 28d 6h 30m
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ACME TRANSFORMER T 1 81048 100VA 1PH 120 240V AC 12 24V AC TRANSFORMER D468143
$23.00
Time Remaining: 25d 22h 5m
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Toroidal Core Transformer 250 VA 120 VAC 24 VAC KIS KLS
$18.00
Time Remaining: 4d 3h 17m
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Gti 24Vac Transformer step down 120v to 24vac open frame
$24.00
Time Remaining: 21h 22m
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SIEMENS MT0075B Class 2 Transformer24VAC75 VA1 PH G6704205
$49.93
Time Remaining: 29d 13h 43m
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NEW 50 VA HARTLAND CONTROLS PE 10 5105 277 VAC 24 VAC CONTROL TRANSFORMER
$24.88
Time Remaining: 3d 7h 29m
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Dongan 33 170 145 Industrial Control Transformer 170kVA 120 24VAC New
$39.95
Time Remaining: 20d 22h 40m
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Tyco Electronics Control Transformer Box Of 10 120VAC to 24VAC 50VA 50 60Hz
$100.00
Time Remaining: 5d 2h 25m
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120 240 to 24 VAC 250 VA 105 C Control Transformer ImperviTRAN Micron B250LP7JX
$35.00
Time Remaining: 5d 4h 4m
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Tyco Electronics PRI 208 230VAC 43VA 50 60Hz SEC 24VAC Transformer 21J2101
$19.99
Time Remaining: 28d 1h 8m
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STEP DOWN TRANSFORMERS 75VA 120 24VAC 60Hz 30T 5019 24V
$19.99
Time Remaining: 10d 20h 44m
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Control Stepdown TRANSFORMER 120V 240V x 24VAC CTO350 K00 350VA
$45.00
Time Remaining: 2d 21h 48m
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Dormeyer DCT 40 120 Foot or 1 2 NPT Hub 120VAC 24VAC Transformer 40VA New
$18.00
Time Remaining: 24d 23h 51m
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Basler BE116440CAA 120V 60HZ 48A 24VAC 40VA plug in transformer power supply
$23.99
Time Remaining: 16d 18h 51m
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Tyco 4000 13E07K662 Transformer 5 1611455 7 40VA 24 VAC
$16.99
Time Remaining: 8d 23h
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Amseco Class 2 Transformer 40VA 24VAC XT 2440 lot of 4
$50.00
Time Remaining: 2d 55m
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Tyco Electronics PRI 277VAC 40VA 50 60Hz SEC 24VAC Transformer 1091226
$19.99
Time Remaining: 25d 20h 42m
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TDC Power Transformer DA 20 24 Input 120VAC Output 24VAC 083A 20VA FREE SHIP
$20.99
Time Remaining: 4d 4h 1m
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PACKARD 120 208 240V CLASS 2 TRANSFORMER 24VAC 40VA NEW BOXED
$26.50
Time Remaining: 27d 17h 49m
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ACME T 1 81048 GENERAL PURPOSE 120 240V AC 12 24V AC VOLTAGE TRANSFORMER B430616
$23.00
Time Remaining: 2d 20h 4m
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New Sloan Optima Transformer EL 154 120 vac 24 vac 50 va
$16.99
Time Remaining: 15d 2h 19m
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MARS 50321 POWER TRANSFORMER 120 208 240 480 VOLT 24 VAC 75VA REPLACES 7541C
$39.95
Time Remaining: 24d 2h 12m
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ServiceFirst 24VAC 75VA Transformer 120 208 240 480 TRR00475 X13550226147 24V
$49.23
Time Remaining: 24d 12h 1m
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MARS CONTROL 50327 Transformer 24VAC
$24.99
Time Remaining: 19d 3h 42m
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Core Components 120 024 050 TF CB 120v PRI 24vac 50va transformer NIB IA
$15.00
Time Remaining: 4d 5h 18m
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HONEYWELL AT72D 1691 MULTI MOUNT CONTROL CIRCUIT TRANSFORMER 40 VA 24 VAC NEW
$30.00
Time Remaining: 13d 10m
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NIB PASS SEYMOUR 1039 TRANSFORMER 75 VA 277 VAC 24 VAC 312 AMP
$49.90
Time Remaining: 11d 9h 48m
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CUTLER HAMMER C0075E1B INDUSTRIAL CONTROL TRANSFORMER PRI 120 240 SEC 24VAC
$45.00
Time Remaining: 2d 22h 57m
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NEW Tyco Transformer PRI 208 240 SEC 24VAC 50VA 50 60Hz 24L5301 4000Y09AW18K08
$19.99
Time Remaining: 28d 3h 8m
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Lee Model 598 Transformer New Old Stock 120v input 8 24vac output
$23.99
Time Remaining: 11d 1h 27m
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Lot of 2 Sloan Optima EL154 120 VAC 24 VAC 50 VA Transformer
$29.00
Time Remaining: 23d 3h 50m
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Transformer 120 208 240 480V X 24VAC 75VA WITH CIRCUIT BREAKER FOOT MOUNT
$49.95
Time Remaining: 18d 21h 27m
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MARCUS MC1KT 1KVA 1PH 120 240V AC 12 24V AC VOLTAGE TRANSFORMER B377560
$80.00
Time Remaining: 25d 3h 13m
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REVERE RT2420 UL PLUG IN TRANSFORMER 24VAC 20VA
$17.10
Time Remaining: 16d 1h 25m
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Functional Devices TR50VA014 Class 2 Transformer 24VAC 50VA 1 Phase Off6A
$17.99
Time Remaining: 3d 3h 49m
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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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