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I have a Trane model TWE030P13FBO that keeps blowing the 5 amp fuse tied into the transformer. Just to see if I could solve the problem I put in a 10 amp fuse and the transformer smoked and I'm sure now that I've blown that. What could be blowing the fuse? I had 220 going to the trans. and 24 coming out. There seemed to be a long dely in starting and then it would blow the fuse. Condenser capictor is fine, blower works in the "ON" postion...?

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Hi,
You have a short in the low voltage...it could be the t-stat or the wiring to the t-stat...also could be the coil if a contactor, or a wire rubbed through somewhere...

To find it you need to start to isolate sections of the low voltage circuit and then ohm out each section...problem is that some will still not show up with out power applied... believe me this is not fun and can make ya pull your hair out...be patient and persistent...
but as you found out do not try a higher amp fuse...transformers work on smoke...and when the smoke comes out they no longer work... :-)

heatman101

Posted on Sep 15, 2010

Testimonial: "Time to call in the pros. Thanks heatman!"

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How can i get a replacement 5 amp 125 volt fuse for a holmes twin widow fan


It's worth noting here that it's more about the physical size & shape of the Fuse thats needed to fit your Fan.
You don't have to use exactly a 5 amp @ 125v fuse.
Any fuse that Fits and is in the range of 5,6,7,8,10 Amp and even 230v is ok.
The fuse is like a piece of soft metal that will melt if too much current is being drawn by the device. The Amps & Volts only define approximately when the fuse link will melt (blow). But as the fan gets dirty and older the LOAD it draws might get slightly higher. Enough to cause the fuse to slowly melt. So a small to 6, 8, or 10 Amp should work just fine. A wiring short will still cause the 10 Amp fuse to blow thereby keeping things safe. The manufacturer uses a fuse that fits in the space he has allocated & allows the unit to run continuously without blowing on a slight load.
But it is only a safety device to protect the device from internal shorts.
It stops a shorted motor or shorted internal wiring from getting too hot and possibly causing a fire.
But a 20 or 30Amp fuse would still blow if it is shorted.
For example...If the 5 A fuse keeps blowing then you could try say an 8 or 10 Amp fuse. If that blows then their is definitely a problem with the circuit. Don't put anything larger than 10 Amp in.
It then needs to be looked at by a service technician.


The voltage rating on a household fuse isn't that critical.
It's actually the wattage it takes to melt the fuse link. It's based on the mathematics of Ohms Law (Watts =Volts x Amps)
But thats another story....
Cheers
Trevor

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It's likely a bad limit switch. Be sure to remove wires from both sides and test continuity through limit.

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Should have a 5 amp fuse on red wire in between transformer and tstat. If not put one. This will protect transformer. Turn power off and take a good picture of tstat wiring. Remove all wires to the tstat. With the air handler wires join fan and red. (Likely green) let run. Then add compressor and reversing valve ( if reversing valve is energized in cooling ) which in most cases it is. Should then have cold air. Let run. If no problems you know it's outside of the machine. Tstat or wiring. Hook inside of machine all back up to tstat wires. Do the same thing with the tstat wire inside the thermostat. If no problems, must be bad tstat. Hook everything back up right. If fuse blows or transformer because you didn't put the fuse, then you know for sure it's the stat. Good Luck

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How about if you just turn parking lights on, not headligths

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1 Answer

The 5 amp fuse on the board keeps blowing the transformer smoked i replaced that but it still blows the fuse when i install a new fuse.the contactor buzzes then the fuse blows.


You ahve a short in the low voltage system, thats why the fuse blows and the transformer burned out. Find the short and then replace that fuse and that should solve your problem.

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What size is the fuse that is blowing? Does it go to the transformer 3-5 amp fuse? If it is a 30-60 amp fuse then you have a line voltage short and need to call a serviceman.

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1 Answer

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I have searched high and low for a schematic and that model number doesn't even come up anymore? I have worked on bryant units for years . I can tell you by the 036 , it is a 3 ton unit. as far as replacing the transformer, you may not need a diagram. If you know what the voltage is coming into the unit, lets say208/230 and look to see what your control voltage is by looking at the voltage rating on one of the parts in the system, I would say 24volts, your chances are good you can install the transformer. A new 208/230voltx24volt trans, comes with all of the wiring laied out for you. Find the 2 high voltage Line wires coming in and tie to the high side of the transformer, and the 2 wires labeled for 24 volts to the load side, and your all set.Keep in mind that some of these universial transformers come with several colored wires for different voltages, so be sure to look at the transformer diagram and it will tell you what colors to tie together for the voltage you need. You should be able to pick up where you're friend left off, just look for the high volts in for one side and low volts out for the control side.Be sure to have a meter on hand to check the voltage. Just take your time, you can do this.

Ps It wouldn't hurt to add a 5 amp auto fuse to one of the wires on the low voltage side of the transformer, in case you miss wire it, and it will blow the fuse and save the new transformer.All you need is 2 female spade connectors and a 5 amp fuse.
Good Luck, Sincerely, shastalaker7


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