Carrier apu comfort pro 200INT

Discussion in 'Ask An Owner Operator' started by HeavyHaulPete2004, Aug 7, 2022.

  1. HeavyHaulPete2004

    HeavyHaulPete2004 Bobtail Member

    10
    5
    Sep 21, 2021
    0
    Hi y'all

    I have a carrier comfort pro 200INT dated 2021 build. It has started doing this funky crap where it will idle down as if shutting off but come right back up again. It has also started acting up while cranking as if it was starving for fuel (doesn't always do it). My company just put this unit in a couple months ago. Now when it idles down, sometimes my AC shuts off even though the fans are blowing (but not cold). Then I hear the AC compressor kick back on and get cold. But this can take a couple minutes. The only lights that are on are the sol hold and alt power (I believe this to be normal) from what I've read. Any help would be great thanx
     
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  3. mudflap77

    mudflap77 Heavy Load Member

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    1,193
    Oct 11, 2010
    South western Ontario
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    Check the clamp on the fuel lines. Particularly around the line filter. I had a gear clamp broken and you couldn't tell without pulling it right off the line.
    Not sure if I'm understanding what you mean about the ac. Unless the newer Carriers are different they don't idle down. They start, they run at thier set rpm, and shut off. Carrier apu run a generator to power your hvac. Basically your ac compressor has a built in electric motor. So if the rpms drop to idle I guess there isn't enough electricity generated to power the ac compressor.
     
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  4. HeavyHaulPete2004

    HeavyHaulPete2004 Bobtail Member

    10
    5
    Sep 21, 2021
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    The idle down is just a symptom that I'm experiencing. The AC works great. No the AC system hasn't changed. It's just when the APU idle drops, sometimes the AC compressor stops as well. Doesn't always do it. I'm just trying to figure the RPM dropping issue. I've been watching the DC voltage on my power inverter and it doesn't change. I have been running my microwave when this happens and it keeps working. So I'm not losing AC power either. I'll have to check the fuel filter again. It did seem OK last time I looked.
     
  5. mudflap77

    mudflap77 Heavy Load Member

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    Oct 11, 2010
    South western Ontario
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    With mine it started after the first or second service and the tech had a he'll of a time bleeding it. Then it was fine for a month or so and start having starting issues. As I said I couldn't see it was broken until I took the clamp right off.

    Also your evaporator could be freezing up. If your hvac box is accessible pull the filter out and see if core is frosty.
    But I think it is caused by the rpm drop
     
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