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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: 8d 14h 19m
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Kele 691 K1A 12024 vac 100 va Transformer
Kele 691 K1A 12024 vac 100 va Transformer
$35.00
Time Remaining: 15d 5h 38m
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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: 2d 12h 14m
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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: 3d 11h 40m
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Honeywell transformer AT140A 1000 24VAC 40VA 120V 60 HZ pri
Honeywell transformer AT140A 1000 24VAC 40VA 120V 60 HZ pri
$17.50
Time Remaining: 13d 17h 19m
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MG Electronics 24VAC Class 2 Transformer Model MGT2450
MG Electronics 24VAC Class 2 Transformer Model MGT2450
$19.00
Time Remaining: 4d 10h 27m
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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
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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: 2d 12h 11m
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HONEYWELL 198162P 120V AC 24V AC TRANSFORMER B444976
HONEYWELL 198162P 120V AC 24V AC TRANSFORMER B444976
$20.00
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HAMMOND SL350JR 350VA 120V AC 12 24V AC VOLTAGE TRANSFORMER B444995
HAMMOND SL350JR 350VA 120V AC 12 24V AC VOLTAGE TRANSFORMER B444995
$35.00
Time Remaining: 29d 7h 42m
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Amseco Class 2 Transformer 40VA 24VAC XT 2440 lot of 4
Amseco Class 2 Transformer 40VA 24VAC XT 2440 lot of 4
$50.00
Time Remaining: 10h 10m
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DSC PTC2440U Plug In Transformer 24VAC 40VA
DSC PTC2440U Plug In Transformer 24VAC 40VA
$15.00
Time Remaining: 22d 14h 19m
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120V 24V Transformer 120VAC 24VAC 125A 57LEIB24125 Irritrol Rain Dial RD 600
120V 24V Transformer 120VAC 24VAC 125A 57LEIB24125 Irritrol Rain Dial RD 600
$19.98
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NEW ACME TRANSFORMER TA 2 81151 1KVA 1PH 120 240V AC 24V AC TRANSFORMER D384080
NEW ACME TRANSFORMER TA 2 81151 1KVA 1PH 120 240V AC 24V AC TRANSFORMER D384080
$95.00
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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
$19.95
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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 13h 27m
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Honeywell AT72D 1006 2 Transformer Power Supply for furnace 40 VA 24VAC Output
Honeywell AT72D 1006 2 Transformer Power Supply for furnace 40 VA 24VAC Output
$15.00
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NEW EGS E500D HEVI DUTY 500VA 1PH 240 480V AC 24V AC TRANSFORMER D446122
NEW EGS E500D HEVI DUTY 500VA 1PH 240 480V AC 24V AC TRANSFORMER D446122
$100.00
Time Remaining: 29d 3h 59m
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24vac transformer 50va 120vac to 24vac  New Surplus 24volt
24vac transformer 50va 120vac to 24vac New Surplus 24volt
$15.00
Time Remaining: 9d 17h
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93132 Old Stock Honeywell 198162F Cover Assembly w Transformer 24Vac 40VA
93132 Old Stock Honeywell 198162F Cover Assembly w Transformer 24Vac 40VA
$33.99
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Class 2 Transformer 24VAC 75 VA 1 PH
Class 2 Transformer 24VAC 75 VA 1 PH
$30.00
Time Remaining: 7d 14h 6m
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2 HONEYWELL AT72D1683 TRANSFORMER 120V PRIMARY 24VAC SECONDARY 40VA
2 HONEYWELL AT72D1683 TRANSFORMER 120V PRIMARY 24VAC SECONDARY 40VA
$39.90
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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: 8d 5h 36m
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120vac to 24vac 75va Transformer
120vac to 24vac 75va Transformer
$25.00
Time Remaining: 21d 18h 26m
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SIEMENS MT0075B FUSIBLE VOLTAGE 75VA 1PH 240 480V AC 24V AC TRANSFORMER B295227
SIEMENS MT0075B FUSIBLE VOLTAGE 75VA 1PH 240 480V AC 24V AC TRANSFORMER B295227
$37.00
Time Remaining: 29d 7h 42m
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MUUNTOSAHKO OY TRANSFORMER SC 9542 2 X 115V 50 60HZ OUTPUT 24VDC 24VAC NEW
MUUNTOSAHKO OY TRANSFORMER SC 9542 2 X 115V 50 60HZ OUTPUT 24VDC 24VAC NEW
$69.99
Time Remaining: 29d 18h 39m
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ACME T 1 81048 GENERAL PURPOSE 120 240V AC 12 24V AC VOLTAGE TRANSFORMER B430616
ACME T 1 81048 GENERAL PURPOSE 120 240V AC 12 24V AC VOLTAGE TRANSFORMER B430616
$23.00
Time Remaining: 1d 5h 20m
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This is a new RIB PSB100AB10 Transformer Control 24 vac 100 va Class 2 As sh
This is a new RIB PSB100AB10 Transformer Control 24 vac 100 va Class 2 As sh
$55.00
Time Remaining: 4d 7h 18m
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MARCUS MC500B 500VA 1PH 120V AC 24V AC VOLTAGE TRANSFORMER B374803
MARCUS MC500B 500VA 1PH 120V AC 24V AC VOLTAGE TRANSFORMER B374803
$50.00
Time Remaining: 22d 11h 1m
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MARCUS MC1K5B 15KVA 1PH 120 240V AC 12 24V AC VOLTAGE TRANSFORMER B406919
MARCUS MC1K5B 15KVA 1PH 120 240V AC 12 24V AC VOLTAGE TRANSFORMER B406919
$100.00
Time Remaining: 15d 7h 18m
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Trane 120 to 24 VAC Transformer 40VA NEW
Trane 120 to 24 VAC Transformer 40VA NEW
$15.00
Time Remaining: 29d 7h 48m
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PRIMARY 333VA 120V AC SECONDARY 24V AC 288VA TRANSFORMER D326803
PRIMARY 333VA 120V AC SECONDARY 24V AC 288VA TRANSFORMER D326803
$41.00
Time Remaining: 29d 5h 25m
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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: 6d 10h 5m
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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: 29d 11h 27m
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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: 26d 3h 39m
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TYCO 4001 09J15K42 CLASS 2 VOLTAGE 75VA 208 240V AC 24V AC TRANSFORMER B300330
TYCO 4001 09J15K42 CLASS 2 VOLTAGE 75VA 208 240V AC 24V AC TRANSFORMER B300330
$20.00
Time Remaining: 10d 5h 5m
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PRODUCTS CONTROL TRANSFORMER 4000 13J13T216 PRI 208 240 480 SEC 24VAC 75 VA 75
PRODUCTS CONTROL TRANSFORMER 4000 13J13T216 PRI 208 240 480 SEC 24VAC 75 VA 75
$17.50
Time Remaining: 2d 6h 2m
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SIEMENS MT0050B TRANSFORMER PRIM 240 480VAC SEC 24VAC 50VA FUSED LNC
SIEMENS MT0050B TRANSFORMER PRIM 240 480VAC SEC 24VAC 50VA FUSED LNC
$19.99
Time Remaining: 8d 8h 57m
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TRANSFORMER HCT 09E0BB06 40VA 208 240X24VAC
TRANSFORMER HCT 09E0BB06 40VA 208 240X24VAC
$39.99
Time Remaining: 29d 13h 4m
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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: 18d 9h 28m
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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: 8d 9h 23m
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HONEYWELL AT140A1000 TRNSFORMER 24VAC 40VA NEW IN A BOX
HONEYWELL AT140A1000 TRNSFORMER 24VAC 40VA NEW IN A BOX
$17.00
Time Remaining: 9d 11h 6m
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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: 17d 6h 15m
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SQUARE D 9070T350D23B 350VA 120 240V AC 24V AC VOLTAGE TRANSFORMER B381510
SQUARE D 9070T350D23B 350VA 120 240V AC 24V AC VOLTAGE TRANSFORMER B381510
$30.00
Time Remaining: 1d 3h 38m
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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: 3d 8h 19m
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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: 26d 3h 4m
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EGS HS19F500B 500VA 1PH 120 240V AC 12 24V AC TRANSFORMER B406061
EGS HS19F500B 500VA 1PH 120 240V AC 12 24V AC TRANSFORMER B406061
$50.00
Time Remaining: 13d 12h 29m
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Basler BE116440CAA 120V 60HZ 48A 24VAC 40VA plug in transformer power supply
Basler BE116440CAA 120V 60HZ 48A 24VAC 40VA plug in transformer power supply
$23.99
Time Remaining: 15d 3h 7m
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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: 4d 5h 3m
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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: 1d 7h 8m
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LOT 2 DONGAN YD60B 017 120V AC 24V AC 40VA CONTROL POWER TRANSFORMER B296689
LOT 2 DONGAN YD60B 017 120V AC 24V AC 40VA CONTROL POWER TRANSFORMER B296689
$40.00
Time Remaining: 4d 5h 26m
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NEW Tyco Transformer PRI 240V SEC 24VAC 50 60HZ 30VA 4000 02M04K109 63005 002
NEW Tyco Transformer PRI 240V SEC 24VAC 50 60HZ 30VA 4000 02M04K109 63005 002
$19.99
Time Remaining: 27d 5h 53m
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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: 15d 7h 38m
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PH 75Z60D1 32H607 75KVA 1PH 460V AC 24V AC TRANSFORMER D398369
PH 75Z60D1 32H607 75KVA 1PH 460V AC 24V AC TRANSFORMER D398369
$46.00
Time Remaining: 7h 12m
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JOHNSON VF2N02A100GL VF VOLTAGE 100VA 1PH 120V AC 24V AC TRANSFORMER B236873
JOHNSON VF2N02A100GL VF VOLTAGE 100VA 1PH 120V AC 24V AC TRANSFORMER B236873
$30.00
Time Remaining: 20d 3h 12m
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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: 14d 13h 16m
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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: 20d 18h 1m
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Hulda 101551028010 Transformer 115VDC to 24VAC 75VA
Hulda 101551028010 Transformer 115VDC to 24VAC 75VA
$20.00
Time Remaining: 25d 7h 28m
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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: 8d 19h 2m
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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: 5d 6h 5m
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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
$20.00
Time Remaining: 2d 7h 44m
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GE 9T51B0110 1KVA 1PH 120 240V AC 12 24V AC VOLTAGE TRANSFORMER D429066
GE 9T51B0110 1KVA 1PH 120 240V AC 12 24V AC VOLTAGE TRANSFORMER D429066
$72.00
Time Remaining: 25d 9h 32m
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HONEYWELL AT140A1000 CONTROL VOLTAGE 40VA 120V AC 24V AC TRANSFORMER B282330
HONEYWELL AT140A1000 CONTROL VOLTAGE 40VA 120V AC 24V AC TRANSFORMER B282330
$20.00
Time Remaining: 11d 12h 53m
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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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