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Lot of 2 Sloan Optima EL154 120 VAC 24 VAC 50 VA Transformer
Lot of 2 Sloan Optima EL154 120 VAC 24 VAC 50 VA Transformer
$29.00
Time Remaining: 11d 8h 5m
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Power Supply P N 654 0111 0031A Input 120 VAC 45W Output 24VAC 15A
Power Supply P N 654 0111 0031A Input 120 VAC 45W Output 24VAC 15A
$14.99
Time Remaining: 38m
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Lot of 5 24VAC Transformer 120VAC Primary 24VAC Secondary
Lot of 5 24VAC Transformer 120VAC Primary 24VAC Secondary
$20.00
Time Remaining: 5d 2h 57m
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Power Transformer 117VAC 24VAC Center Tap 12 0 12 3A 28N091
Power Transformer 117VAC 24VAC Center Tap 12 0 12 3A 28N091
$18.10
Time Remaining: 8d 1h 41m
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FUNCTIONAL DEVICES RIB TR50VA004 TRANSFORMER 120 240 277 480 to 24vac
FUNCTIONAL DEVICES RIB TR50VA004 TRANSFORMER 120 240 277 480 to 24vac
$19.99
Time Remaining: 24d 20h 30m
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Dormeyer DCT 40 120 Foot or 1 2 NPT Hub 120VAC 24VAC Transformer 40VA New
Dormeyer DCT 40 120 Foot or 1 2 NPT Hub 120VAC 24VAC Transformer 40VA New
$18.00
Time Remaining: 28d 22h 34m
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24vac transformer 50va 120vac to 24vac  New Surplus 24volt
24vac transformer 50va 120vac to 24vac New Surplus 24volt
$20.00
Time Remaining: 15d 6h 27m
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Power Transformer 117VAC 24VAC Center Tap 12 0 12 5A
Power Transformer 117VAC 24VAC Center Tap 12 0 12 5A
$23.95
Time Remaining: 8d 1h 38m
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Core Components CPS 120 24 100U Transformer Power Supply 120VAC 24VAC New
Core Components CPS 120 24 100U Transformer Power Supply 120VAC 24VAC New
$49.95
Time Remaining: 29d 21h 54m
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ACME TB 81146 INDUSTRIAL CONTROL 250VA 120 240V AC 24V AC TRANSFORMER B295899
ACME TB 81146 INDUSTRIAL CONTROL 250VA 120 240V AC 24V AC TRANSFORMER B295899
$51.00
Time Remaining: 8d 21h 46m
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24VAC 40VA Plug In Class 2 Transformer UL Listed AM 241660A
24VAC 40VA Plug In Class 2 Transformer UL Listed AM 241660A
$19.95
Time Remaining: 14d 3h 46m
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Trane 120 to 24 VAC Transformer 40VA NEW
Trane 120 to 24 VAC Transformer 40VA NEW
$15.00
Time Remaining: 4d 21h 13m
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HPS Control Transformer120x240 to 12x24 VAC PH50PG
HPS Control Transformer120x240 to 12x24 VAC PH50PG
$39.95
Time Remaining: 22d 19h 49m
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Dayton Control Transformer 4MTV8 240 480VAC in 24VAC out 1000VA Rating NEW
Dayton Control Transformer 4MTV8 240 480VAC in 24VAC out 1000VA Rating NEW
$247.96
Time Remaining: 7d 3h 3m
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Used DORMEYER DCT 40 120 Class 2 Control Transformer 120v Input 24V AC Output
Used DORMEYER DCT 40 120 Class 2 Control Transformer 120v Input 24V AC Output
$19.99
Time Remaining: 20d 17h 37m
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NEW 50 VA HARTLAND CONTROLS PE 10 5105 277 VAC 24 VAC CONTROL TRANSFORMER
NEW 50 VA HARTLAND CONTROLS PE 10 5105 277 VAC 24 VAC CONTROL TRANSFORMER
$24.88
Time Remaining: 7d 6h 12m
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HAMMOND ES4EA 120 240V AC 12 24V AC VOLTAGE TRANSFORMER B426912
HAMMOND ES4EA 120 240V AC 12 24V AC VOLTAGE TRANSFORMER B426912
$135.00
Time Remaining: 28d 23h 9m
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HONEYWELL AT72D1683 CONTROL CIRCUIT TRANSFORMER 120V 24VAC 40VA WITH MOUNT PLATE
HONEYWELL AT72D1683 CONTROL CIRCUIT TRANSFORMER 120V 24VAC 40VA WITH MOUNT PLATE
$22.99
Time Remaining: 1d 8h 34m
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Basler Electric 200 230 VAC Primary 24 VAC Secondary Transformer 75 VA Class 2
Basler Electric 200 230 VAC Primary 24 VAC Secondary Transformer 75 VA Class 2
$25.00
Time Remaining: 20d 21h 5m
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DSC PTC2440U Plug In Transformer 24VAC 40VA
DSC PTC2440U Plug In Transformer 24VAC 40VA
$15.00
Time Remaining: 28d 3h 46m
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TYCO 4600 213C02AB48 TRANSFORMER 230V 265VAC 20VA OUT 24VAC CLASS 2
TYCO 4600 213C02AB48 TRANSFORMER 230V 265VAC 20VA OUT 24VAC CLASS 2
$20.00
Time Remaining: 11d 23h 32m
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NOSIB HONEYWELL AT140A 1000 Transformer 24 VAC 40 VA 120 V 60 Hz Primary
NOSIB HONEYWELL AT140A 1000 Transformer 24 VAC 40 VA 120 V 60 Hz Primary
$19.99
Time Remaining: 26d 18h 30m
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TRANSFORMER HCT 09E0BB06 40VA 208 240X24VAC
TRANSFORMER HCT 09E0BB06 40VA 208 240X24VAC
$39.99
Time Remaining: 5d 2h 31m
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Elettromeccanica Trasformatori 24127 CEI96 1 005 kVA Transformer 24 VAC 50 VA
Elettromeccanica Trasformatori 24127 CEI96 1 005 kVA Transformer 24 VAC 50 VA
$45.00
Time Remaining: 4d 19h 22m
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New Honeywell Transformer 24 VAC 32001652 001 99 3259705 HE220A1043 HE260A1044
New Honeywell Transformer 24 VAC 32001652 001 99 3259705 HE220A1043 HE260A1044
$26.00
Time Remaining: 23d 1h 23m
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JOHNSON CONTROLS Y65AS 1 120V AC 24V AC 40VA TRANSFORMER B277911
JOHNSON CONTROLS Y65AS 1 120V AC 24V AC 40VA TRANSFORMER B277911
$20.00
Time Remaining: 13d 19h 4m
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ACME T 1 81048 GENERAL PURPOSE 100VA 120X240V AC 12X24V AC TRANSFORMER B281753
ACME T 1 81048 GENERAL PURPOSE 100VA 120X240V AC 12X24V AC TRANSFORMER B281753
$23.00
Time Remaining: 16d 22h 21m
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Tyco Electronics Control Transformer Box Of 10 120VAC to 24VAC 50VA 50 60Hz
Tyco Electronics Control Transformer Box Of 10 120VAC to 24VAC 50VA 50 60Hz
$100.00
Time Remaining: 9d 1h 7m
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PACKARD 120 208 240V CLASS 2 TRANSFORMER 24VAC 40VA NEW BOXED
PACKARD 120 208 240V CLASS 2 TRANSFORMER 24VAC 40VA NEW BOXED
$26.50
Time Remaining: 1d 16h 32m
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PACKARD 120 208 240V CLASS 2 TRANSFORMER 24VAC 40VA
PACKARD 120 208 240V CLASS 2 TRANSFORMER 24VAC 40VA
$22.50
Time Remaining: 22d 19h 42m
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NEW HONEYWELL AT140A1000 CLASS 2 40VA 3PH 120V AC 24V AC TRANSFORMER B298258
NEW HONEYWELL AT140A1000 CLASS 2 40VA 3PH 120V AC 24V AC TRANSFORMER B298258
$20.00
Time Remaining: 10d 19h 32m
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HONEYWELL MULTI MOUNT AT72D1683 NEMA Rated CONTROL TRANSFORMER 24VAC 40VA NIB
HONEYWELL MULTI MOUNT AT72D1683 NEMA Rated CONTROL TRANSFORMER 24VAC 40VA NIB
$37.50
Time Remaining: 26d 21h 50m
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Transformer 120VAC 24VAC 7511CBSH 120 024 075 TF CB KMC XEE 6111 075
Transformer 120VAC 24VAC 7511CBSH 120 024 075 TF CB KMC XEE 6111 075
$22.00
Time Remaining: 1d 1h 47m
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Kele 691 K1A 12024 vac 100 va Transformer
Kele 691 K1A 12024 vac 100 va Transformer
$35.00
Time Remaining: 20d 18h 51m
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Hulda 101551028010 Transformer 115VDC to 24VAC 75VA
Hulda 101551028010 Transformer 115VDC to 24VAC 75VA
$20.00
Time Remaining: 20h 55m
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Transformer 120 208 240 480V X 24VAC 75VA WITH CIRCUIT BREAKER FOOT MOUNT
Transformer 120 208 240 480V X 24VAC 75VA WITH CIRCUIT BREAKER FOOT MOUNT
$49.95
Time Remaining: 22d 20h 10m
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ALTRONIX 24VAC OUTPUT 100VA OUTPUT T24130 OPEN FRAME TRANSFORMERS
ALTRONIX 24VAC OUTPUT 100VA OUTPUT T24130 OPEN FRAME TRANSFORMERS
$30.00
Time Remaining: 10d 8h 32m
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NEW Honeywell Transformer AT87A1189 NEMA TYPE E 24VAC 48 VA 277V Foot Mount
NEW Honeywell Transformer AT87A1189 NEMA TYPE E 24VAC 48 VA 277V Foot Mount
$19.99
Time Remaining: 13d 21h 31m
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EDWARDS 88 250 250VA 120V AC 4 24V AC VOLTAGE TRANSFORMER B389913
EDWARDS 88 250 250VA 120V AC 4 24V AC VOLTAGE TRANSFORMER B389913
$50.00
Time Remaining: 23d 33m
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Functional Devices RIB PSH75A75AB10 Enclosed Dual 75VA multi tap 24Vac UL NEW
Functional Devices RIB PSH75A75AB10 Enclosed Dual 75VA multi tap 24Vac UL NEW
$75.00
Time Remaining: 25d 20h 57m
Buy It Now for only: $75.00
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Sloan Optima Transformer EL154 120 Vac 24 Vac 50 VA
Sloan Optima Transformer EL154 120 Vac 24 Vac 50 VA
$26.00
Time Remaining: 29d 7h 42m
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HONEYWELL 14505206 001 VOLTAGE 120V AC 24V AC STEP DOWN TRANSFORMER B366208
HONEYWELL 14505206 001 VOLTAGE 120V AC 24V AC STEP DOWN TRANSFORMER B366208
$25.00
Time Remaining: 8d 21h 24m
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Tyco Transformer PRI 480V SEC 24VAC 50 60Hz 75VA
Tyco Transformer PRI 480V SEC 24VAC 50 60Hz 75VA
$21.99
Time Remaining: 6d 20h 30m
Buy It Now for only: $21.99
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Lot of 2 Basler Electric 200 230 VAC Primary 24 VAC Secondary Transformer 75VA
Lot of 2 Basler Electric 200 230 VAC Primary 24 VAC Secondary Transformer 75VA
$35.00
Time Remaining: 20h 52m
Buy It Now for only: $35.00
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Transformer 050KVA General Signal P19FB50 HEVI DUTY TYPE A 120 240V12 24VAC
Transformer 050KVA General Signal P19FB50 HEVI DUTY TYPE A 120 240V12 24VAC
$20.00
Time Remaining: 15d 22h 36m
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4031PT Class 2 Transformer 120 208 240 VOLT 24 VAC 40VA Prepaid Shipping
4031PT Class 2 Transformer 120 208 240 VOLT 24 VAC 40VA Prepaid Shipping
$60.00
Time Remaining: 9d 8h 27m
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NEW VESTIL 01 129 001 40VA 120 208 230 460V AC 24V AC TRANSFORMER D385111
NEW VESTIL 01 129 001 40VA 120 208 230 460V AC 24V AC TRANSFORMER D385111
$51.00
Time Remaining: 13d 22h 50m
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Transformer Used Basler Electric Transformer 115V 50 60HZ Leads output 24V AC
Transformer Used Basler Electric Transformer 115V 50 60HZ Leads output 24V AC
$22.00
Time Remaining: 12d 3h 25m
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NEW 2602 50 3948803F 50VA 110 220V AC 24V AC TRANSFORMER D293422
NEW 2602 50 3948803F 50VA 110 220V AC 24V AC TRANSFORMER D293422
$20.00
Time Remaining: 1d 21h 41m
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Transformer HCT 01E0BB06 Pri 120VAC Sec 24VAC 40VA
Transformer HCT 01E0BB06 Pri 120VAC Sec 24VAC 40VA
$25.00
Time Remaining: 19d 22h 5m
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RIB TR50VA006 CLASS B TRANSFORMER 50VA 24VAC 50 60 HZ 277V NEW IN BOX FREE SHIP
RIB TR50VA006 CLASS B TRANSFORMER 50VA 24VAC 50 60 HZ 277V NEW IN BOX FREE SHIP
$19.99
Time Remaining: 26d 7h 29m
Buy It Now for only: $19.99
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DONGAN YD60B 017 CLASS 2 CONTROL VOLTAGE 40VA 120V AC 24V AC TRANSFORMER B314559
DONGAN YD60B 017 CLASS 2 CONTROL VOLTAGE 40VA 120V AC 24V AC TRANSFORMER B314559
$25.00
Time Remaining: 15d 20m
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MA Line Step Down Transformer Class II 24VAC Out MA TX779
MA Line Step Down Transformer Class II 24VAC Out MA TX779
$29.95
Time Remaining: 20d 2h 44m
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Transformer AC Power Supply 24 VAC center tapped
Transformer AC Power Supply 24 VAC center tapped
$25.00
Time Remaining: 15d 6h 27m
Buy It Now for only: $25.00
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General Electric 9T51B108 Dry Type QB 500 KVA Transformer 120 240 12 24 VAC
General Electric 9T51B108 Dry Type QB 500 KVA Transformer 120 240 12 24 VAC
$40.00
Time Remaining: 1d 17h 6m
Buy It Now for only: $40.00
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White Rodgers 90 T96F2 Class 2 Transformer 120 240 VAC Input 12 24 VAC Output
White Rodgers 90 T96F2 Class 2 Transformer 120 240 VAC Input 12 24 VAC Output
$33.00
Time Remaining: 23d 22h 55m
Buy It Now for only: $33.00
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120vac to 24vac 75va Transformer
120vac to 24vac 75va Transformer
$25.00
Time Remaining: 27d 7h 53m
Buy It Now for only: $25.00
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LOT 2 HONEYWELL AT140A1000 CONTROL TRANSFORMER 120V 24VAC 40VA B249478
LOT 2 HONEYWELL AT140A1000 CONTROL TRANSFORMER 120V 24VAC 40VA B249478
$30.00
Time Remaining: 24d 17h 56m
Buy It Now for only: $30.00
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Honeywell AT72D1683 Multi Mount Control Circuit Transformer 120V 24VAC 40VA
Honeywell AT72D1683 Multi Mount Control Circuit Transformer 120V 24VAC 40VA
$20.00
Time Remaining: 22d 4h 19m
Buy It Now for only: $20.00
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Plate Mount Transformer Primary 120V 24VAC Secondary 40VA X1355028401
Plate Mount Transformer Primary 120V 24VAC Secondary 40VA X1355028401
$20.00
Time Remaining: 29d 20h 50m
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ATC FTC7524Q CLASS 2 75VA 120V AC 24V AC VOLTAGE TRANSFORMER B393833
ATC FTC7524Q CLASS 2 75VA 120V AC 24V AC VOLTAGE TRANSFORMER B393833
$25.00
Time Remaining: 27d 19h 33m
Buy It Now for only: $25.00
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FUSED 24VAC CONTROL TRANSFORMER 120 240V 50VA Multi Mount
FUSED 24VAC CONTROL TRANSFORMER 120 240V 50VA Multi Mount
$28.50
Time Remaining: 24d 16m
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Carrier 75va Transformer 200 230 460 Primary vac x 24 vac secondary
Carrier 75va Transformer 200 230 460 Primary vac x 24 vac secondary
$31.99
Time Remaining: 3d 3m
Buy It Now for only: $31.99
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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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