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Transformer HCT 01E0BB06 Pri 120VAC Sec 24VAC 40VA
$16.00
Time Remaining: 4d 2h 57m
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GE 453XT1AJ2E 75VA CONTROL TRANSFORMERS 120 24 VAC
$17.50
Time Remaining: 10d 3h 5m
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LOT OF 3 MG ELECTRONICS MGT2440 120V 24VAC CLASS 2 TRANSFORMER 40VA
$19.99
Time Remaining: 26d 7h 53m
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New Sloan Optima Transformer EL 154 120 vac 24 vac 50 va
$16.99
Time Remaining: 3d 5h 54m
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24VCT 24V 12V Transformer 12V 0 12V CT 3A 110Vac 220Vac to 24Vac 12Vac free shi
$19.95
Time Remaining: 5d 47m
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Sloan Optima EL154 120 VAC 24 VAC 50 VA Transformer NEW
$21.99
Time Remaining: 16d 18h 17m
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120V 24V Transformer 120VAC 24VAC 125A 57LEIB24125 Rain Bird ESP 4M
$24.99
Time Remaining: 9d 13h 26m
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Transformer Mars 50354 Replaces 4031F Foot Mount PRI 120 208 240V SEC24VAC 40VA
$16.50
Time Remaining: 29d 1h 29m
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SLOAN Chrome Transformer NIB Mount EL248 40 120 VAC Input 24 VAC Output 50 OFF
$17.99
Time Remaining: 3d 9h 32m
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Power Transformer 117VAC 24VAC Center Tap 12 0 12 5A 28N073
$23.95
Time Remaining: 22d 6h 30m
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Transformer 40VA Steveco 90 4021F Foot Mount PRI 208 240VAC SEC 24VAC
$16.99
Time Remaining: 29d 40m
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Hulda 101551028010 Transformer 115VDC to 24VAC 75VA
$20.00
Time Remaining: 15d 1h 47m
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Power Transformer 117VAC 24VAC Center Tap 12 0 12 3A 28N091
$18.95
Time Remaining: 22d 8h 11m
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Basler Electric 200 230 VAC Primary 24 VAC Secondary Transformer 75 VA Class 2
$25.00
Time Remaining: 5d 1h 57m
Buy It Now for only: $25.00
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Hatco 021702300 24 vac Transformer
$25.00
Time Remaining: 27d 6h 59m
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RIB TR100VA1001 100VA Transformer 120V Primary 24VAC Secondary
$25.75
Time Remaining: 8d 5h 10m
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4031PT POWER TRANSFORMER PRI120 208 240V SEC24VAC 40VA
$59.95
Time Remaining: 20d 8h 49m
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1 New JARD TRANSFORMER PTS1004824 B81 FOOT MOUNT 120 208 240 480VAC SEC24VAC
$19.85
Time Remaining: 29d 5h 39m
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NEW Tyco Transformer PRI 240V SEC 24VAC 50 60HZ 30VA 4000 02M04K109 63005 002
$19.99
Time Remaining: 17d 12m
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MARS CONTROL 50327 Transformer 24VAC 50VA 80Hz4000Y08CJ15K00 3697P Trane A C
$15.95
Time Remaining: 23d 35m
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New Honeywell Transformer AT140A1000 Secondary 24VAC 40Va Primary 120V 60Hz
$18.95
Time Remaining: 4d 11h 47m
Buy It Now for only: $18.95
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Lot of 2 Basler Electric 200 230 VAC Primary 24 VAC Secondary Transformer 75VA
$35.00
Time Remaining: 15d 1h 44m
Buy It Now for only: $35.00
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FUNCTIONAL DEVICES INC RIB TR100VA001 Class 2 Transformer 24VAC 100 VA 1 PH
$31.92
Time Remaining: 7d 15h 56m
Buy It Now for only: $31.92
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TDC Power Transformer DA 20 24 Input 120VAC Output 24VAC 083A 20VA FREE SHIP
$22.99
Time Remaining: 23d 8h 9m
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TRANSFORMER HCT 09E0BB06 40VA 208 240X24VAC
$39.99
Time Remaining: 19d 7h 23m
Buy It Now for only: $39.99
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Tyco 4000 13E07K662 Transformer 5 1611455 7 40VA 24 VAC
$16.99
Time Remaining: 27d 2h 34m
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FUNCTIONAL DEVICES INC RIB TR50VA002 Class 2 Transformer 24VAC 50 VA 1 PH
$18.33
Time Remaining: 10d 6h 47m
Buy It Now for only: $18.33
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ACME ELECTRIC TBGX81143 Control Transformer 120 240VAC 24VAC 1 Phase 100VA NEW
$50.00
Time Remaining: 22d 2h 2m
Buy It Now for only: $50.00
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New MG Electronics 24VAC Class 2 Transformer Model MGT2450
$18.99
Time Remaining: 17d 14h 26m
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PACKARD 120 208 240V CLASS 2 TRANSFORMER 24VAC 40VA NEW BOXED
$26.50
Time Remaining: 15d 21h 23m
Buy It Now for only: $26.50
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Adams Rite 4606 110VAC to 24VAC Plug In Transformer
$35.00
Time Remaining: 29d 5h 26m
Buy It Now for only: $35.00
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HoneyWell AT72 D 1683 Control Circuit Transformer Pri 120VAC Sec 24VAC NEW
$18.95
Time Remaining: 26d 12h 52m
Buy It Now for only: $18.95
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NEW CORE 120 024 075 TF CB Control Transformer 75VA 120 24 VAC NIB
$19.99
Time Remaining: 28d 4h 43m
Buy It Now for only: $19.99
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12V Transformer 12V 0 12V CT 3AMP 3000mA 110VAC to 12VAC 24VAC NEW
$19.99
Time Remaining: 14d 5h 27m
Buy It Now for only: $19.99
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Transformer AC Power Supply 24 VAC center tapped
$25.00
Time Remaining: 29d 11h 19m
Buy It Now for only: $25.00
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TDC Power Transformer DA 20 24 Input 120VAC Output 24VAC 083A 20VA FREE SHIP
$24.99
Time Remaining: 23d 8h 17m
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Honeywell AT140A 1000 Transformer Class 2 24 VAC 40 VA 120 V 60 HZ FREE SHIP
$22.73
Time Remaining: 8d 2h 49m
Buy It Now for only: $22.73
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LOT OF 2 NEW HONEYWELL AT72D1683 TRANSFORMER 120V PRIMARY 24 VAC SECONDARY 40VA
$40.00
Time Remaining: 21d 4h 15m
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TYCO 4600 213C02AB48 TRANSFORMER 230V 265VAC 20VA OUT 24VAC CLASS 2 GUARANTEED
$16.99
Time Remaining: 14d 5h 13m
Buy It Now for only: $16.99
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Amana Goodman Janitrol Transformer 110 24 vac B11416 00
$20.00
Time Remaining: 5d 13h 4m
Buy It Now for only: $20.00
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FUNCTIONAL DEVICES INC RIB TR75VA001 Class 2 Transformer 24VAC 75 VA 1 PH
$18.52
Time Remaining: 14d 17h 6m
Buy It Now for only: $18.52
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Square D control transformer 50va 480 24vac 9070T50D70 60 day warranty used
$42.00
Time Remaining: 19d 2h 1m
Buy It Now for only: $42.00
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MG Electronics 24 VAC Class 2 Transformer 20 VA w LED MGT 2420 Free S
$19.99
Time Remaining: 3d 7h 57m
Buy It Now for only: $19.99
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AC AC Power Signal Transformer In 120V 60Hz Out 12VAC+12VAC or 24VAC
$23.99
Time Remaining: 11h 26m
Buy It Now for only: $23.99
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Revere RT2440 RT 2440 UL Plug in Transformer 24 VAC 40 VA NEW IN BOX
$26.95
Time Remaining: 12d 4h 11m
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HONEYWELL AT140A1000 TRANSFORMER 24VAC 120V PRIMARY NEW CONDITION IN BOX
$20.00
Time Remaining: 11h 59m
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Tyco Electronics Control Transformer Box Of 10 120VAC to 24VAC 50VA 50 60Hz
$100.00
Time Remaining: 23d 5h 59m
Buy It Now for only: $100.00
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ALTRONIX T24130D Class 2 Transformer 24VAC 100 VA
$29.01
Time Remaining: 10d 2h 27m
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New Cerus 7551MWCB Multi Tap Control Transformer 24 VAC
$65.58
Time Remaining: 25d 5h 14m
Buy It Now for only: $65.58
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Square D 50SV43A General Transformer 120 240VAC to 12 24VAC 50VA
$74.95
Time Remaining: 22d 1h 26m
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HAMMOND PT50PG TRANSFORMER PRIM 120 240VAC SEC 24VAC 50VA NIB
$24.99
Time Remaining: 2d 2h 52m
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TYCO 4600 213C02AB48 TRANSFORMER 230V 265VAC 20VA OUT 24VAC CLASS 2
$20.00
Time Remaining: 5d 1h 3m
Buy It Now for only: $20.00
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Dayton 4MTU1 Control Transformer Primary 120 240VAC Secondary 24VAC 1500VA 1Ph
$94.99
Time Remaining: 4d 6h 43m
Buy It Now for only: $94.99
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2 Tyco Transformers PRI 120V SEC 24VAC 50 60HZ 40VA 4000 01V18G386 E0086100
$17.50
Time Remaining: 15d 14h 29m
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2 HONEYWELL AT72D1683 TRANSFORMER 120V PRIMARY 24VAC SECONDARY 40VA
$39.90
Time Remaining: 1d 12h 29m
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Universal Transformer 24VAC 40VA 48W UB2440W Class 2 Transformer UL Listed
$23.99
Time Remaining: 19d 11h 29m
Buy It Now for only: $23.99
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Dongan 33 170 145 Industrial Control Transformer 170kVA 120 24VAC New
$39.95
Time Remaining: 9d 2h 15m
Buy It Now for only: $39.95
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SIEMENS MT0050B TRANSFORMER PRIM 240 480VAC SEC 24VAC 50VA FUSED LNC
$19.99
Time Remaining: 28d 3h 16m
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CUTLER HAMMER C0075E1B INDUSTRIAL CONTROL TRANSFORMER PRI 120 240 SEC 24VAC
$45.00
Time Remaining: 21d 2h 32m
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NEW Tyco Transformer PRI 208 240 SEC 24VAC 50VA 50 60Hz 24L5301 4000Y09AW18K08
$19.99
Time Remaining: 16d 6h 42m
Buy It Now for only: $19.99
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Folger Adam Electric Door Controls E193069 24VAC Transformer RT G2450SL M
$75.00
Time Remaining: 9d 3h 3m
Buy It Now for only: $75.00
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Universal Transformer 24VAC 40VA 48W UB2440WR Class 2 UL Resettable
$19.99
Time Remaining: 18d 14h 52m
Buy It Now for only: $19.99
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120V 24V Transformer 120VAC 24VAC Irritrol Rain Dial RD 600 RD 900 RD 1200
$24.99
Time Remaining: 4d 23h 23m
Buy It Now for only: $24.99
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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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