Results 1 to 5 of 5

Thread: Clearing HEVAC faults

  1. #1
    Join Date
    May 2008
    Location
    Camp Hill, Brisbane
    Posts
    171

    Clearing HEVAC faults

    Having trouble clearing HEVAC fault (RH blend motor feedback potentiometer error) after replacing and checking the pot in the blend motor. I 'clear faults' in the Nanocom and cycle ignition, but fault is still there when I read again and checkbook comes up almost immediately on the display. Confusing because the blend motor doesn't even get nudged to check the potentiometer anyway.
    I'd like to recalibrate blend and distribution motors, but this doesn't happen either despite progress bar displayed on the Nanocom.
    I'd be grateful for any tips or advice.
    TIA

    Steve
    '95 HSE

  2. #2
    Join Date
    Jan 2016
    Location
    Netherlands
    Posts
    146
    I ran into this problem with a set of blend motors myself. It was quite a b*tch to get that to work. I have 3 pairs of motors and 2 hevac units and between the lot I got it to work out. I first connected a pair of know good motors to the hevac unit and send them to the middle position. I switched these to the other hevac unit to clear the error (and keep it cleared) then I started messing around with the other motors on the spare hevac to get them to behave Once I had the set I wanted to use in a state where they were NOT on their ends (some I had to manually move with a power supply) I cleared faults in the spare hevac and positioned the motors in a known good position. I then proceeded to mounting the motors so that they could not accidentally overrun (they have slightly less movement when mounted) and connected them to the hevac unit I intended to use. Once "booted" I could run the calibration test and voila! no errors and the motors have been working since.

    I'm pretty sure some steps I have taken are not needed but that is what I did to get it working. ymmv.

    Good luck!

    -P

  3. #3
    Join Date
    May 2008
    Location
    Camp Hill, Brisbane
    Posts
    171
    Thanks!
    So, my best option might be to manually drive all three motors to midpoints and try again.
    Steve

  4. #4
    Join Date
    Jan 2016
    Location
    Netherlands
    Posts
    146
    Steve,

    Yes and make sure they are mounted so they can't overrun.

    Cheers,
    -P

  5. #5
    Join Date
    Oct 2017
    Location
    nowra
    Posts
    60

    on mine the right is the left ??

    hi all just to add to the confusion ,,
    my motors are reverced to the nanocom ,,
    If i cycle the left (on the nanocom ) the right blend motor runs if i do the right the left one moves ,,
    I talked to Lee at labtronics he says this is a comon fault ,,, and some replace the wrong side ,,,
    lee has a fix give him a yell ,,,

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Search AULRO.com ONLY!
Search All the Web!