Question about Haier HC48C1VAR Central Air Conditioner

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One unit runs a while, powers down, other unit blows transformer

Central a/c units. one unit keeps blowing transformer, other unit runs for hour or so, then completely shuts down for several hours

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  • ktscolors May 31, 2009

    There is a transformer on the unit that controls power via thermostat to outside unit controls.

    "When you say "TRANSFORMER", do you mean the one on the light pole at the street??"
    -If I was blowing the transformer at the pole at the street, my house would blow up.

  • Ken Beccu May 11, 2010

    When you say "TRANSFORMER", do you mean the one on the light pole at the street?? There isn't any transformer on your A.C. system. There are capacitors, contactors, thermostats, that's it. No transformers I can think of on a 4 ton unit.



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Probably a control board that has gone bad and keeps blowing the transformers! While testing just add an inline 3 amp fused link to keep from blowing the transformer and just fuses until you find out if the board is not working properly! The transformer is what converts the line supply voltage to 24v to control all the low voltage devices such as contactor/relay and reversing valves and solenoids! The other unit is overheating and tripping the internal overload inside the compressor. You can cool it down quicker with a garden hose and cool water running over it. Try making sure that the outdoor coils are cleaned free of debris and I would actually use some coil cleaner to really get them clean. Also be aware of the outdoor fan is running up to speed or at all in some cases.Replace fan motor if not! Change the Capacitor also! The run capacitor could be the culpret all together! $10 or so and may solve the over heating issue alltogether! Goodluck and hope this info gets you pointed in the right direction!

Posted on Aug 22, 2010

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You say it keeps blowing the transformer? you mean circuit breaker? if it is the circuit breaker, have the wiring checked for a short, if no short do a ohm test on the compressor. it may have shorted out internaly.

Posted on May 31, 2009


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SOURCE: my furnace is blowing cold air

Is the a/c a heatpump also? Is the furnace gas, electric? Thanks

Posted on Dec 06, 2008

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SOURCE: 3 amp fuse blows after three hours on Goodman 4 ton 16 seer pump

I would suspect you have a problem in the defrost circuit of your heat pump. there are a couple of things you can try. first just run the system on emergency heat and see what happens. you could have a defrost board that is shorting when it kicks into defrost. it sends a signal back to the furnace so it will come on during defrost. if you do not blow a fuse as long as you are running in emergency heat, i would suspect the defrost control board. also you could have a dead short in the wire that runs from the "w" terminal on furnace control board, out to the heat pump. keep in mind that any of the wires could be the cause and i am just tying to give you the most common things. your furnace will still run if you unhook all the low voltage wiring out at the heat pump. if you do this and stop blowing fuses. you know it is something on that wiring. goodl luck.

Posted on Jan 27, 2009

  • 22 Answers

SOURCE: Unit will not cool below 76 degrees

Sounds like you need a freon charge on the unit. Check filtes for air restriction as well.

Posted on Jun 24, 2010

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