Question about Carrier 38BRC048 Air Conditioner

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Carrier Air Conditioning

I have to pull the disconnect on my AC since I had a blower fan replaced a couple of months ago. I know one has nothing to do with the other, but when the tech was changing the motor he had to remove the mother board to access the motor. I wonder if he could have possibly moved one of the dip switch's. There are no codes and the compressor outside will run continuously even when the furnace is on unless I pull the disconnect. I noticed this about a half hour after the tech left. He would not come back unless he could charge a service call even if it was his fault! It should be something simple, it was working fine before except for some blower motor noise.

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  • JPE1 May 30, 2008

    Thanks, I have not had a chance to try anything yet. I'll try as soon as I get home. JPE



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Have the tech come back. the problem did not exsist before he pulled the board. He either left his jumper wire connected by misteak or he shorted the wires to get the fan come on so he could check the operation. Either way he created this mess and is responsible. Most service techs would return and fix his problem just out of pride in his work. If this guy will not return then contact the BBB and the licesing board for the state you live in they have an investigative unit just for guys like this. good luck

Posted on Sep 19, 2008

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Posted on Jun 26, 2008

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I've never seen a bad control board cause this fault. The condenser is controlled by a relay in the outdoor section which in turn is controlled by a 24v signal from the control board. It's possible the contacts on the relay in the outdoor section are frozen in the closed position- whatever caused the control board failure could have also caused the relay failure but it wouldn't be evident until much later unless the technician looked for that specifically. It's also possible that there was a simple wiring error was made and the relay was connected directly to (C) and (R) on the control board, bypassing the control circuit entirely as foolish a mistake as this would be I think it's at least as likely if not more so than frozen contacts on the relay. I can't imagine any two wires very likely to short and cause this failure other than red and yellow from the control board, possible but I would think unlikely. Simple test- turn power off at the breaker to the indoor section If the out door condenser continues to run Its the compressor relay. If it does not I would investigate the wiring on the control board If the wiring is correct then change out the control board after discovering what caused two control boards to fail.

Posted on May 31, 2008

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If the outside unit runs continually, check your thermostat and make sure there is no call for A/C. Inspect what thermostat wiring you can find and look for wires that may be touching together. On the outside unit, remove one of the 24 volt thermostat wires from the control and see if the unit stops running. If it does, you either have a short somewhere or a bad control board in your air handler.

Posted on May 30, 2008

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