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comfort pro apu no heat no ac no fan but panel is on and apu starts

Discussion in 'Trucks [ Eighteen Wheelers ]' started by jimkas, Jun 9, 2023.

  1. Jun 9, 2023 #1
    jimkas

    jimkas Bobtail Member

    7
    0
    Jun 4, 2023
    0
    My APU comfort pro unit turns on and everything well, but when I click AC or HEAT or FAN inside the panel nothing turns on or works and it stays at the main screen. Any1 knows why or how to fix it? thank you

    volvo vnl 670 2016
     
    jimkas, Jun 9, 2023
    jimkas, Jun 9, 2023
    #1
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  3. Jun 9, 2023 #2
    Arctic_fox

    Arctic_fox Experienced mx13 execrator

    3,864
    19,461
    Sep 16, 2016
    0
    Check fuses first and formost. To me it sounds like something went pop. If that doesnt fix it check that the pannel hasnt come unhooked or loose somehow.

    Beyond that im not great with carriers so id take it to a dealer.
     
    Arctic_fox, Jun 9, 2023
    Arctic_fox, Jun 9, 2023
    #2
    Siinman and jimkas Thank this.
  4. Jun 9, 2023 #3
    jimkas

    jimkas Bobtail Member

    7
    0
    Jun 4, 2023
    0
    .
     
    jimkas, Jun 9, 2023
    jimkas, Jun 9, 2023
    #3
  5. Jun 9, 2023 #4
    jimkas

    jimkas Bobtail Member

    7
    0
    Jun 4, 2023
    0
    yeah, the panel works and it starts the apu outside but once i click any function outside of menu etc it doesnt kick anything on and it just kinda refreshes and goes back to the main menu.
    u mean the board hvacs relays or the fuse outside at the APU side ? ive checked 1 glass fuse at the board and its fine the rest are all relay box fuses.
     
    jimkas, Jun 9, 2023
    jimkas, Jun 9, 2023
    #4
  7. Apr 19, 2024 #5
    angel8492

    angel8492 Bobtail Member

    1
    0
    Apr 19, 2024
    0
    I have the exact same problem, let me know if you fix it
     
    angel8492, Apr 19, 2024
    angel8492, Apr 19, 2024
    #5
  8. Jul 23, 2024 #6
    joec214

    joec214 Bobtail Member

    2
    0
    Mar 20, 2022
    0
    Did anyone figure out how to fix this issue?

    I'm having the same problem. APU starts, but nothing happens when I push the AC or Heat button. Just stays on main screen.
     
    joec214, Jul 23, 2024
    joec214, Jul 23, 2024
    #6
  9. Jul 23, 2024 #7
    mitrucker

    mitrucker Road Train Member

    5,140
    8,804
    Dec 15, 2010
    Lapeer, MI
    0
    Same here. About to give up on the whole thing and have it removed. Company truck, let it idle.
     
    mitrucker, Jul 23, 2024
    mitrucker, Jul 23, 2024
    #7
  10. Jul 24, 2024 #8
    Luwi67

    Luwi67 Heavy Load Member

    746
    484
    Oct 24, 2012
    Long island
    0
    The A/C fan must have a relay. Check to see if power is getting to the relay when A/C is on. If yes, see if power is getting past the relay. If no power to relay, trace back from there, you'll need a wiring diagram.

    This of course is if you want to save some coin and try to solve the problem yourself.
     
    Luwi67, Jul 24, 2024
    Luwi67, Jul 24, 2024
    #8
    joec214 Thanks this.
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