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Problem with my AC unit

Hi I'm Phillip i have a problem with my AC unit the problem is that i just replace the control transformer on my AC unit cause yesterday it got burn out cause when i turn on my AC i can hear the compressor kick in but the blower don't turn on and the control transformer get hot if it get hot it get burn out but when i turn the heat on the blower turn on and the heat works but not the AC only the compressor kick in not the blower relay fan can you help me pls

the model # is B20-03-15c00001T its a sun dail it was working all fine then i turn the AC on the control transformer burn out cause it got hot cause the blower didnt turn

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Check your fan motor capcitor if the blower motor wont run. It sounds as though it is trying to run, as it is getting hot, and is prob. feed from the control circuit that the transform is on

Posted on May 22, 2012

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Ac unit outside is off but in the inside still throwing air inside.

Posted on Jun 26, 2009

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Hi Phillip,

Check your thermostat wires to see if you have any of them which are bare and touching. If any are touching separate them and tape em up and try unit again. You have a direst short in your cooling portion of the unit.

Posted on Feb 12, 2009

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maybe not, are the fuses ok ? check fuses, make sure they are ok, also some transformers has a thermistor in between the winding of the transformer in series with the primary winding. Phillip do make their transformers with that kind of protection, just in case the transformer over heat it shuts down. examine the transformer look for the thermistor it is open.

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Turn unit on and runs for about a minute , the whole time thermostatic touch control is dimming, at the time unit stops, the control the led temp indicators and touch led go almost completely out. Is it...

Typically if a transformer is bad, it will just short out and not give you any voltage (and or trip breaker, blow fuse), if its working intermittently and smelling, i'd be more suspicious of the control board and or the wiring to it.

Also anything that has a integrated control board in my experience will either function properly or act erratic. I'd be more suspicious of the board. Is the there customer service number on the unit you can call at all.

I work more on commercial refrigeration and AC units myself, not familiar with this brand.

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If the unit powers through an ac wall transformer its probably the cause, they burn out
all the time.

Replace it with the same rating that is shown on the unit (input/outpu

hope this helps

Jul 24, 2012 | Acer Aspire One Netbook 8.9" Notebook

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I have a intertherm electric furnace model #FEH=015HA=03 w/ an A coil for my AC. Date code 870902 . It burns out the transformer. It did it about a month ago and it was replaced by a certified electrician....

There is a short in the low voltage wiring somewhere...this type of thing can be very hard to track down and is probably a wire rubbed through somewhere...
Have the electrician install a 5 amp. automotive type fuse in the low voltage wiring right after the transformer to keep from burning up anymore transformers...I would do this even if you think you find the problem...


Mar 23, 2011 | Heating & Cooling

1 Answer

My thermostat as working great yesterday, this a.m. the display screen is blank. Does it use batteries?

some use batteries and some do not...if it is blank or say -ac then you have most likely lost 24 volt power which originates from the inside heating unit... some units do have a fuse installed for this emergency inthe heater unit..make sure you replace it with the same size if it does... if it does not the you may have burned out the low voltage transformer in the heating unit which is usually caused by a short in the low voltage wiring somewhere. if this is a heat pump system and only happened in the heat mode then most likely the short is on the outside unit....

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I think you have a definite short and it's in the 24 volt circuit. The only problem is - 'finding a low voltage short' is not the easiest thing in the world to do - so - I would guess you'd need a Service Tech.

good luck!

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1 Answer

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well it has blown the fuse on the transformer, then you have coil switch bad.It could be the coil on the contath in for cooling.But can check by taking the yellow wire a loose and see if the don't blow. The red wire is one side of the transformer and the com could be any color.But look at the red wire because it is the main wire that travel the voltage throuhg the unit.

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