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24VAC 40VA Plug In Class 2 Transformer UL Listed AM 241660A
$19.95
Time Remaining: 18d 9h 42m
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Power Transformer 117VAC 24VAC Center Tap 12 0 12 3A 28N091
$18.10
Time Remaining: 12d 7h 37m
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DSC PTC2440U Plug In Transformer 24VAC 40VA
$15.00
Time Remaining: 2d 9h 42m
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Honeywell AT72D 1006 2 Transformer Power Supply for furnace 40 VA 24VAC Output
$15.00
Time Remaining: 29d 21h 8m
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Tyco Electronics Control Transformer Box Of 10 120VAC to 24VAC 50VA 50 60Hz
$100.00
Time Remaining: 13d 7h 3m
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Gti 24Vac Transformer step down 120v to 24vac open frame
$24.00
Time Remaining: 6d 12h 25m
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Lot of 2 Sloan Optima EL154 120 VAC 24 VAC 50 VA Transformer
$29.00
Time Remaining: 22d 23h 57m
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120 240 to 24 VAC 250 VA 105 C Control Transformer ImperviTRAN Micron B250LP7JX
$35.00
Time Remaining: 13d 8h 42m
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Power Transformer 117VAC 24VAC Center Tap 12 0 12 5A 28N073
$23.95
Time Remaining: 12d 7h 34m
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Basler BE116440CAA 120V 60HZ 48A 24VAC 40VA plug in transformer power supply
$23.99
Time Remaining: 24d 23h 16m
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24vac transformer 50va 120vac to 24vac New Surplus 24volt
$15.00
Time Remaining: 19d 12h 23m
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FUNCTIONAL DEVICES RIB TR50VA004 TRANSFORMER 120 240 277 480 to 24vac
$24.99
Time Remaining: 25d 8h 56m
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HAMMOND SL350JR 350VA 120V AC 12 24V AC VOLTAGE TRANSFORMER B444995
$35.00
Time Remaining: 9d 3h 5m
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Core Components 120 024 050 TF CB 120v PRI 24vac 50va transformer NIB IA
$15.00
Time Remaining: 12d 9h 57m
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SQUARE D 9070T150D14 Transformer150VA208VAC To 24VAC
$138.00
Time Remaining: 29d 14h 14m
Buy It Now for only: $138.00
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White Rodgers 90 T96F2 Class 2 Transformer 120 240 VAC Input 12 24 VAC Output
$33.00
Time Remaining: 28d 4h 51m
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New Sloan Optima Transformer EL 154 120 vac 24 vac 50 va
$16.99
Time Remaining: 23d 6h 58m
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120V 24V Transformer 120VAC 24VAC 125A 57LEIB24125 Rain Bird ESP 4M
$19.99
Time Remaining: 5d 11h 1m
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Hammond Manufacturing 25 VA Single Phase Control Transformer 120 VAC to 24 VAC
$15.00
Time Remaining: 24d 6h 26m
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Tyco 4000 13E07K662 Transformer 5 1611455 7 40VA 24 VAC
$16.99
Time Remaining: 17d 3h 38m
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JOHNSON VF2N02A100GL VF VOLTAGE 100VA 1PH 120V AC 24V AC TRANSFORMER B236873
$30.00
Time Remaining: 26d
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MG Electronics 24VAC Class 2 Transformer Model MGT2450
$19.00
Time Remaining: 14d 5h 50m
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Honeywell AT72D1683 Multi Mount Control Circuit Transformer 120V 24VAC 40VA
$20.00
Time Remaining: 1d 12h 15m
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MARS 50321 POWER TRANSFORMER 120 208 240 480 VOLT 24 VAC 75VA REPLACES 7541C
$39.95
Time Remaining: 2d 6h 50m
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Tyco Transformer PRI 480V SEC 24VAC 50 60Hz 75VA
$18.69
Time Remaining: 11d 2h 48m
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Class 2 Transformer 24VAC 75 VA 1 PH
$30.00
Time Remaining: 17d 9h 29m
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Kele 691 K1A 12024 vac 100 va Transformer
$35.00
Time Remaining: 26d 1h 3m
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CUTLER HAMMER C0075E1B INDUSTRIAL CONTROL TRANSFORMER PRI 120 240 SEC 24VAC
$45.00
Time Remaining: 11d 3h 36m
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JOHNSON CONTROLS Y65AS 1 120V AC 24V AC 40VA TRANSFORMER B277911
$19.95
Time Remaining: 14d 16h 45m
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Trane 120 to 24 VAC Transformer 40VA NEW
$15.00
Time Remaining: 9d 3h 11m
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24VCT 24V 12V Transformer 12V 0 12V CT 3A 110Vac 220Vac to 24Vac 12Vac free shi
$19.95
Time Remaining: 25d 1h 51m
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RIB TR50VA004US Class 2 Transformer 24VAC 50 VA 1 PH
$55.13
Time Remaining: 28d 4h 8m
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General Electric 9T51B108 Dry Type QB 500 KVA Transformer 120 240 12 24 VAC
$40.00
Time Remaining: 5d 23h 2m
Buy It Now for only: $40.00
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Revere Wall Transformer RT G2450SL M 3 MOV Surge Protection 24VAC 50VA
$75.00
Time Remaining: 6d 3h 38m
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TYCO 4000A04AW18K158 0919 VOLTAGE 50VA 480V AC 24V AC TRANSFORMER B277766
$25.00
Time Remaining: 14d 7h 36m
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SQUARE D 9070T200D23 Transformer200VA120 240VAC To 24VAC
$149.17
Time Remaining: 28d 12h 18m
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TYCO 4600 213C02AB48 TRANSFORMER 230V 265VAC 20VA OUT 24VAC CLASS 2
$20.00
Time Remaining: 16d 5h 28m
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SQUARE D 9070T200D2 Transformer200VA240 480VAC To 24VAC
$144.38
Time Remaining: 28d 23h 36m
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ACME T 1 81048 GENERAL PURPOSE 120 240V AC 12 24V AC VOLTAGE TRANSFORMER B430616
$23.00
Time Remaining: 11d 43m
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SQUARE D 9070T500D23 Transformer500VA120 240VAC To 24VAC
$213.11
Time Remaining: 28d 20h 3m
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8S11 TRANSFORMER FOR FURNACE 120VAC 24VAC 40W 280 VNL GOOD CONDITION
$18.00
Time Remaining: 24d 11m
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MARS CONTROL TRANSFORMER 24 VAC SECONDARY MODEL 50321
$59.99
Time Remaining: 29d 11h 58m
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Power supply transformer ei 57 input 120 v ac output 24 v ac 12 amp 60 Hz
$17.42
Time Remaining: 5d 8h 8m
Buy It Now for only: $17.42
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REVERE RT2420 UL PLUG IN TRANSFORMER 24VAC 20VA
$18.00
Time Remaining: 24d 6h 3m
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LUTRON SIVOIA SV 100SF JBox TRANSFORMER FOR ROLLER SHADE SYSTEM 24VAC 3 A 75VA
$35.00
Time Remaining: 6d 12h 3m
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NEW 50 VA HARTLAND CONTROLS PE 10 5105 277 VAC 24 VAC CONTROL TRANSFORMER
$24.88
Time Remaining: 11d 12h 8m
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Transformer 120 208 240 480V X 24VAC 75VA WITH CIRCUIT BREAKER FOOT MOUNT
$49.95
Time Remaining: 27d 2h 6m
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PRIMARY 333VA 120V AC SECONDARY 24V AC 288VA TRANSFORMER D326803
$41.00
Time Remaining: 9d 48m
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This is a new RIB PSB100AB10 Transformer Control 24 vac 100 va Class 2 As sh
$55.00
Time Remaining: 5d 2h 43m
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HPS HAMMOND Q1C0ERCB 1KVA 3PH 120 240V AC 12 24V AC VOLTAGE TRANSFORMER B375399
$140.00
Time Remaining: 3d 1h 42m
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Signal Transformer 24 8 Transformer PRI 115 VAC SEC 6 12 18 24 VAC 192VA
$55.18
Time Remaining: 27d 6h 16m
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Square D 50SV43A General Transformer 120 240VAC to 12 24VAC 50VA
$74.95
Time Remaining: 12d 2h 30m
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HAMMOND PT50PG TRANSFORMER PRIM 120 240VAC SEC 24VAC 50VA NIB
$24.99
Time Remaining: 22d 3h 56m
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ACME TRANSFORMER T 1 81052 750VA 1PH 12 24V AC VOLTAGE TRANSFORMER D453848
$40.00
Time Remaining: 25d 7h 7m
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Johnson 40va transformer 24VAC primary foot mounting
$18.25
Time Remaining: 24d 14h
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9070EO17D2 Control Transformer Square D In240 480Vac Out 24Vac New
$39.97
Time Remaining: 28d 2h 13m
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MARCUS MC1KT 1KVA 1PH 120 240V AC 12 24V AC VOLTAGE TRANSFORMER B377560
$80.00
Time Remaining: 3d 7h 52m
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NEW 2602 50 3948803F 50VA 110 220V AC 24V AC TRANSFORMER D293422
$20.00
Time Remaining: 6d 3h 37m
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PACKARD 120 208 240V CLASS 2 TRANSFORMER 24VAC 40VA NEW BOXED
$26.50
Time Remaining: 5d 22h 27m
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SQUARE D 9070TF100D2 Transformer100VA240 480VAC To 24VAC
$108.55
Time Remaining: 28d 13h 36m
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SQUARE D 9070TF150D2 Transformer150VA240 480VAC To 24VAC
$116.61
Time Remaining: 28d 13h 44m
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JOHNSON CONTROLS Y65AS 1 120V AC 24V AC 40VA TRANSFORMER B277911
$20.00
Time Remaining: 18d 59m
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ALTRONIX 24VAC OUTPUT 100VA OUTPUT T24130 OPEN FRAME TRANSFORMERS
$31.91
Time Remaining: 15d 1h 11m
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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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