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  1. #1
    Join Date
    Jul 2008
    Location
    stratford, ct
    Posts
    1

    mitsubishi error code

    i've been fighting with a mr slim model pla42aa ceiling casette system for the past three weeks. originally i had a p4 code which was a bad condensate lift pump (the thing was cooking). replaced that and then wound up replacing the drain sensor today, which is where i still am. now my wired controller is giving me a U4 error code?????? anyone know what this means. mitsubishi tech support is horrible when it comes to speedy response time and i'm just sitting here twiddling my thumbs.

  2. #2
    Join Date
    Apr 2006
    Posts
    33
    pg 14

  3. #3
    Join Date
    Jun 2008
    Location
    LONDON
    Posts
    57

    mitsubishi

    Quote Originally Posted by Enconguy1 View Post
    i've been fighting with a mr slim model pla42aa ceiling casette system for the past three weeks. originally i had a p4 code which was a bad condensate lift pump (the thing was cooking). replaced that and then wound up replacing the drain sensor today, which is where i still am. now my wired controller is giving me a U4 error code?????? anyone know what this means. mitsubishi tech support is horrible when it comes to speedy response time and i'm just sitting here twiddling my thumbs.
    Check all thermistors of the outdoor condensing unit.

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