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Low voltage transformers problems - Electrical Supplies

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  • Craig Butler
    Craig Butler May 11, 2010

    You must give me some idea of what is going on. There is nothing listed! What can I do to help???

  • Hippy_dd May 11, 2010

    whats the problem

  • Keith Fournier May 11, 2010

    What type of problems?

  • Kenneth Reaume' May 11, 2010

    can you describe the problem in detail I may be able to help if I can. Thx

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Make certain that you connect the right wires into the transformer. there should be a wiring diagram on the transformer, this should tell you where the wires need to go. more info will help.

Posted on Nov 14, 2009

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1 Answer

Not getting 24 volts out of transformer to furnace valve why


isolate transformer and check voltage on both end of transformer,

disconnect power and with om-meter check for resistance on high voltage side as well as on low voltage side, check for bridging between the sides and between the chassy and sides. resistance on both sides should be very low, resistance between low and high side and chassy should be very high.

if resistance as described - transformer is ok.

check valve and layout, on layout you should have resistance/voltage points and therefore check them if they are valid.

hope this will help, do not forget to vote...

Jan 01, 2015 | Heating & Cooling

1 Answer

My problem is with the inside air handler of a Ruud system. Would watevers blowing the fuse be making the transformer hum real loud? Or is the other way around?


If the low voltage fuse keeps blowing a short circuit exists somwhere in the low voltage wiring. The hummimg could be the transformer loose or possibly the motor.

Dec 15, 2012 | Heating & Cooling

1 Answer

Loud huming from my 300v low voltage lighting transformer


Transformers make humming sound.
ML300 series transformers make sound.
Used styrafoam to separate transformer from contact with building so sound is not carried.
These transformers have 10 year limited warranty.

Copy following link for general troubleshoot and tips, and warranty information, and trippers.
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

Oct 23, 2012 | Malibu ML300RTW - Low Voltage Power Pack...

1 Answer

TDC low voltage transformer model DA 150 12 W reset button trips


There is a short circuit.
Copy following link to identify possible problem and download manual
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

May 02, 2012 | Hardware & Accessories

1 Answer

I have a self-installed Leviton TTI06-1LM dimmer (600w capacity) that controls a halogen light that uses 12x 12v/20w (140w total) halogen lights. The dimmer works fine, but once a day, or perhaps every...


Your issue is that the dimmer is not rated to handle the type of fixture/lamps its controlling.

From a lighting control standpoint, the 12V-lamps classify as "low-voltage halogen" and, somewhere in that circuit, have a transformer(s) converting the 120V~ down to 12V~. Using incandescent dimmers (like the one you are using) can cause compatibility issues with those transformers. What I suspect is happening is that the incompatibily is either throwing voltage spikes or current spikes on the line which are causing the dimmer to enter some sort of "safety" mode to shut everything down before any problems occur.

My recommendation is to first figure out what type of transformer it is: Either magnetic low-voltage, or electronic low-voltage. Ideally you would contact the transformer manufacturer (or look up their specs online) to figure that out. Other rules of thumb: if the transformer's big & bulky, it's probably magnetic - conversely if its lightweight, it's probably electronic. If its only one transformer controlling all of the lamps together, it's probably magnetic - conversely if its one of those transformers where the transformer and light bulb come togheter as one assembled unit and then snap into the track, it's probably electronic.

Then make sure the dimmer is rated for magnetic low-voltage, or electronic low-voltage (depending upon what the transformer is).

Feb 11, 2011 | Leviton Decora Light Dimmer Switch

1 Answer

My dog chewed the thermostat wire by the compressor, i replaced the chewed wire now the thermostat won't turn on, therefore; no ac.. could it have blown a fuse? if so, where are they?


Either you have blown the low voltage fuse located inside the air handler (if there is one) or you have blown the transformer feeding the low voltage control wiring.

If the transformer is blown due to no fuse installed, I would recommend installing a low voltage 3A fuse in line with the red terminal coming off the transformer. This will protect the transformer in the future.

Aug 01, 2010 | Goodman CKL42AR42 Air Conditioner

1 Answer

Have Malibu low voltage transformer. Need red and


Routinely vailable on eBay...sometimes listed as "Intermatic" (Malibu's parent company.).

Nov 22, 2009 | Malibu ML600TW - Low Voltage Power Pack -...

1 Answer

Have a Ruud AC unit the problem I have after installing a new condenser fan motor when I throw the circuit breaker the unit will not turn on but when I push the contacts on the contactor in manualy the fan...


The contactor engages from low voltage power from the thermostat as does the outside condensing unit. You may have blown the low voltage transformer or have a loose thermostat wire. Check line voltage(220 volts) to the transformer. Check load voltage(24 volts) from the transformer. If no voltage out,replace the transformer. If you have voltage out(24) check the thermostat wires and the thermostat. If you have a digital thermostat there is a 5 minute delay in the thermostat after power is restored before it activates.

Oct 08, 2009 | Ruud Central System Air Conditioner

1 Answer

What Kind of Dimmer?


If the low voltage lighting system uses an electronic transformer, then a dimmer designed for this type of transformer should be used. Likewise, if the low voltage lighting system uses a magnetic transformer, then a dimmer designed for this type of transformer should be used.

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