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

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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

Posted on Dec 12, 2014


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Posted on Jan 02, 2017

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SOURCE: apu fails on heater system

Does heat pumps from 1980"s work without freeon for the heat part?

Posted on Dec 23, 2008

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SOURCE: carier split unit wireing daigram

that would be a pay for answer. Tom

Posted on Jun 21, 2009

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Keypad doesn't work on caterpillar powercube hc-5128 .. need wiring schematic and cannot find one

Hello Gloria Moslander,

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Thermoking apu starts up then runs for a min then shuts off and shiws a code ac5 .what is this code?

If the unit starts and runs for a short period then The code will refer to either low gas or excessive gas in the system or the thermostat to control the temperature is set to close to ambient temperature. I would go for low gas from a leak in the system

Jun 22, 2014 | Cars & Trucks

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Carrier APU wont shut down and showing SP on screen?

Hi there I have seen this a few time's while working on them. The SP stand's for shore power. If you can't get APU to shut down remove the top inspection cover. There is a lever by the fuel solenoid you can push and hold and it will shut the APU down. Do you know if the APU is equipped with shore power? If not I had one do this to me after I power washed it off. If you remove the top cover on the APU on the back wall on the left had side there is a controller. This is called your APU controller. There are to plug's in controller. remove them and check the weather stripping on the plug. I have seen them leak and let moisture in there and it would cause the APU to do funky thing's. If not it's possibly a APU controller. I'd check them few thing's and if you still can't determine a problem get back with me and we can diagnose further.

Sep 21, 2013 | Carrier Air Conditioner Accessories...

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Receiving hardware error 0502 on my A940 printer

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Apu starts fine but no fan no heat and no air conditioning and no 120 volt.

Hi there, Would this be a preheat / comfort pro APU? If so I would start with removing the top cover on the APU. There will be a fuse holder with a 20 amp fuse on the back wall on the left side of the APU above the APU controller. Check and see if the fuse is blown. If it's not then the CCU board under the bunk/ bed isn't seeing power. Either 12v harness or the communication harness both from the APU controller to the CCU board are rubbed on the frame, or the CCU board isn't transferring power properly. The CCU board is under the bunk. There are 4 3/4 bolt's that hold the lid on. Start the APU and look at the board you should have green light's light up. these light's are called input light's. Then chose a function on the driver control panel as in heat, a/c, low or high fan and see if they come on. If the driver control pane are showing the function on look down at the CCU board and see if there are orange light's on. these light's would be your output light's. There's a lot of cause's for this problem if you need further help feel free to ask. Thank's

Nov 08, 2010 | Carrier Heating & Cooling

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Carier split unit wireing daigram

that would be a pay for answer. Tom

Jun 20, 2009 | Heating & Cooling

1 Answer

Apu fails on heater system

Does heat pumps from 1980"s work without freeon for the heat part?

Dec 23, 2008 | Heating & Cooling

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