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Cat excavator ac error codes

eeker63 ยท 2016-05-21 16:08

Does anyone know the error codes for cat excavator climate control? The ac is not working on our 325d and the temperature display is showing codes 43, 44, and 51. I cannot find any info on climate control error codes in the service manual. The vents behind the seat are also not blowing. Thanks

Replies3
  1. #1Cmark2016-05-21 16:39

    43 is for incorrect movement of the discharge air damper. 44 is for incorrect movement of the fresh air damper. 51 is for the refrigerant pressure switch. For the fist two, chances are that something is jamming the mechanism. For E51, you're probably out of gas.

  2. #2John C.2016-05-21 19:21

    The unit is probably packed with dust and debris. A good shop vac and some air pressure to blow the junk out of the works will likely solve most of those issues.

  3. #3eeker632016-05-21 22:54

    Thanks both for the help. I'm sure it's full of junk. Air filter was clogged when we got the machine a few weeks ago and a vent cover is gone (can see it down in the unit).