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Carrier apu troubleshooting

Apu has no power to controller wont do anything is there a reset or what to check first

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Check the breaker

Posted on Apr 15, 2014

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Posted on Jan 02, 2017

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Carrier apu blows cold air for twenty seconds and fan quits engine keeps running and fan starts again but only blows cold air for another twenty seconds


Have you tried rebooting the system? Just turn off the breaker for a few minutes.If you need more questions for your Air Conditioning Repair needs, check us out online.

Jul 07, 2017 | Carrier Heating & Cooling

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I have a carrier comfort pro apu.When I turn on the heat to high it kicks the hvac breaker but runs fine when the heat is on low. What would cause that to heppen.


1. Breaker/wiring too small. Check rating plate, and breaker. Do not replace breaker with larger one without making sure that the wires are large enough to carry the amp load. 2. Shorted high voltage wiring. Check for burned or bare wires.

Jan 04, 2016 | Carrier Heating & Cooling

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Thermoking APU. Why doesn't it work?


Sounds like no power to it. Check the breaker or fuse. Connector may have vibrated loose. If it has a wireless remote, change the batteries in the remote. Good luck.

Sep 15, 2015 | Heating & Cooling

1 Answer

Carier unit starts then shuts down says apu power apu f/b


Low freon: When not running the pressure equalizes. When the unit starts the pressure drops on the low side and the low pressure switch turns it off. This protects the compressor when there is not enough freon to carry the oil it needs

Nov 30, 2014 | Heating & Cooling

1 Answer

I have a carrier apu unit when I torne on it tor of and it says unit onder vortage


Are you on shore power or generator or an extension cord? Low Voltage could be caused by to small wiring.

Oct 09, 2014 | Heating & Cooling

1 Answer

Carrier apu troubleshooting


there are lots of reasons compressor blown, capacitor not working, contactor not being pulled in, thermostat notworking, and i can doon and on

Aug 17, 2014 | Heating & Cooling

1 Answer

How can i tell if my laptop is using its APU or its GPU?


From what I know or have read it's pretty much automatic the computer will switch between them depending on what your doing, basic stuff some videos browser games it will use the 4000, gaming rendering more complex task it will switch to the other, there should be a control panel for the virtu lucid..

May 01, 2014 | AMD Computers & Internet

1 Answer

My comfort pro 6000 apu screen said low voltage and ac wouldnt work


1.Need to check the generator belt to make sure it's not lose or broke.
2.Remove bottom inspection cover and use a fluke meter and check for 110 at generator.
Those two thing's would be where I would start for the low voltage alarm. now for the a/c alarm. There could be multiply thing's to cause the a/c not to work. Do you have and functions on the driver control panel? I would start.
1. Remove the top cover on the APU. Check the 20 amp fuse. If the fuse is blown it will cause you not to get voltage to the CCU board witch could be a reason the a/c is not working. Also if the fuse is blown the first place to look would be the condenser fan on back of the truck. You can use a fluke meter and ohm it out. Don't quote me but I believe it ohms at 10.4 I'd have to look in the book. also use a screw driver and see if the blade is spinning freely it is very common for these to lock up and blow the 20 amp fuse. You can remove the top cover on the CCU under the bunk. There are 4 3/8 bolt's. There should be a little green service light flashing. Then start the APU and there should be green light's light up these light's are your input lights meaning you are getting voltage. When you chose a function on the driver control panel there should be orange light's light up witch would be your output light's. these light's wont come on if the 20 amp fuse is blown. If you need more information I'm willing to help just ask.

Nov 07, 2013 | Carrier Heating & Cooling

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