Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner

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A/C unit Mt weathermaker 8,000 wont turn on , goes on at the thermostat but the outside condenser wont turn on. there is no code flashing it is a continous red light (which it should be!)

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First check the breaker. If it has been tripped then you will surely need a good contractor.

If it has not tripped then double check the thermostat settings and batteries (if applicable). Make sure the fan is set to auto, The cool function has been selected and the temperature has been set low enough for the unit to come on.

If this still does not work then you will still need a technician. This is because there are many more possible failures all of which are relatively dangerous and technical. Good luck!

Posted on Jun 18, 2008

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I have a Carrier Weathermaker model #38tdb060300 A/C system. How many tons is that? It is 11 yrs old, capacitor exploded and compressor is blown. Needing to replace.


Looks like a 5 ton unit. However, you might be better off finding a R-22 condensing unit to replace the entire outside unit. Reason being, if you just replace the compressor, you get a one year warranty. If you replace the whole outside unit, you get a 5 year warranty. You can replace the outside unit with any manufacturer, as long as it is the same tonnage and type (heat pump/air conditioner/single stage/ 2 stage ...).

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How do you know power is at the outdoor unit? Did you check it with a meter? Check your breaker. If there's power at the outdoor unit, then shut the power and test your contacter. If the contacter has supply power then check the low voltage (24-28 volts) that operates the contacter, and if none check the low pressure cut-out,high pressure cut-out and make sure the thermostat is calling for cool. All ok so far, then test your capacitor. I forgot to mention to check for loose, broken, and disconnected wires.

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Sounds like the contactor in the condensing unit is stuck. That is why it will not turn off when the thermostat is satisfied. If the inside air handler is not blowing and the outside condensing unit is running, then this will cause the inside coils to freeze up rather quickly.
The contactor is located in the outside condensing uni in the electrical compartment.
If it is sticking it will need to be replaced.

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1 Answer

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A circuit breaker 'tripping' everytime the AC unit kicks on 'most always' indicates a direct short (somewhere in the condensing unit), although it is possible that the breaker itself is bad - (but not likely).

Usually the cause of this 'short' will be - either the condenser motor in the condensing unit (outside unit) or the compressor - also in the condensing unit.

If you're mechanically inclined - and "very careful" around electricity - there is a fairly simple way to find out which component is causing the short.

Step 1 - Make sure the condensing unit (outside unit) is completely disconnected (electrically) , i.e. pull the fuses/turn off circuit breaker on outside unit and turn off thermostat.

Step 2 - disconnect the condenser motor (this is the outside fan motor). Note: when you disconnect the wires of the condenser motor "be sure" you mark/write their location, and wrap them in electric tape.

Step 3 - start the AC unit. If the breaker trips again you can pretty much rest assured it's the compressor that is shorted.

To prove it (without a doubt) - go to next step.

Step 4 - "be sure circuit breaker and thermostat is turned off" - and - 'reconnect' the condenser motor - and - then disconnect the compressor wires (mark wires and tape them).

Step 5 - Start AC.

If breaker doesn't trip - you know it's the compressor that is shorted.

If breaker 'does' trip again - then it's possible the breaker itself is bad (not likely) or there is a 'short' in the condensing unit's "wiring" somewhere (not likely).

My guess is that either the condenser motor or compressor is shorted.

Hope this helps.

Good Luck!

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