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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Posted on Jan 02, 2017

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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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Turn power off to unit. Open air handler and take a picture of the low voltage (tstat) wires and where they are landed. Remove all thermostat wires from control board. Then replace the 5 amp fuse that is likely on the board. Fuse likely looks like one for a car (blade style). Put a jumper (small piece of wire) from the R terminal to the G terminal and turn power back on to unit. This should bring on the indoor blower. Let me know how that goes!!

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Weathermaker 9300ts wont turn on ac compressor. The insind blower is working The fuses at outside unit is good and yes power is there. the heater works. no flasing lights


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.

Aug 24, 2013 | Carrier Heating & Cooling

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I have a Carrier Weathermaker SX HVAC unit with a Honeywell thermostat. Even if the thermostat is turned "off", my fan keeps blowing!


Hello, usually this is a sign of a bad blower relay on the intergrated control board. The only option is to replace the control board.

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My A/C freezing its coils, while the fans keep running. The AC unit (outside) keep running and never stop caused the coils freezing. It doesn't matter when I turn off or set it to Cool position, the...


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

Everytime my central air unit kicks on my circuit breaker trips. It didn't do this last year or even earlier this year


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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1 Answer

Flashing snowflake on display


That is a Time delay normal to keep the condensing unit from turning of and on to fast really save the life of the equipment

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1 Answer

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Code 12 I believe is power up after power off and a call for heat from the the thermostat. If you have a weak door switch that may be vibrating and going on and off it would cause this as would any thing that causes the power to drop low or out then reapply its self. try holding the door switch in while watching the board and after 2 or 3 minutes the furnace should go on to lite and the blower cycle off. If it stays in this mode try turning the thermostat off (heat - OFF -cool) and then push in the door switch nothing should happen except the lite on the board come on and stay on. If it does this than have someone turn the thermostat to heat and see if it starts or put the door on and set the heat and see if *** goes through the normal cycle of heating. If however it goes right back into the blower mode and shows the 12 code your problem is still with you. So next remove the wire on the "W" terminal on the board. Retry power to the door switch and now nothing should be on except the red lite. If it tries to start the 12 code and blower up again Im pretty sure you have a bad ignition/blower control board.

Mar 08, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

Central Airconditioner Heat Pump Weather King Brand outside unit continues to run even when thermostat is disconnected from terminal block base. Have to flip ckt bkr off to turn unit off. Recently it...


It sounds like you might have a short in the wiring that goes from the furnace (inside part) to the condenser (outside part). Follow these lines by hand and check to see the wire isn't damaged and shorting out.

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