h4-01 on a mx-m550

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  • ssbmi
    Technician
    • Oct 2013
    • 32

    [Error Code] h4-01 on a mx-m550

    I got a mx-m550, h4-01 code. changed out fuser with a rebuilt fuser. same code next day. checked fans both working. going to boards next. or is there something I should be doing first? was there a tech tip/bulletin that I missed on that code?
  • MHeon71
    Trusted Tech

    Site Contributor
    VIP Subscriber
    250+ Posts
    • Oct 2008
    • 485

    #2
    Re: h4-01 on a mx-m550

    H4-01 is low temperature. I would check thermosters and thermostats. Check lamps with TC 5-2, they should blink. According to manual, the interlock switch could cause problem.

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    • divad2k1
      Trusted Tech

      100+ Posts
      • Sep 2010
      • 147

      #3
      Re: h4-01 on a mx-m550

      Do you know if your customer was printing /copying on heavy paper before the code showed up ?

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      • ssbmi
        Technician
        • Oct 2013
        • 32

        #4
        Re: h4-01 on a mx-m550

        Originally posted by divad2k1
        Do you know if your customer was printing /copying on heavy paper before the code showed up ?
        for the first code customer said they did heavy paper, after I changed fuser. 2nd code the next day customer said it was just plain paper... and that was with the rebuilt fuser.

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        • walterman
          Trusted Tech

          Site Contributor
          100+ Posts
          • May 2013
          • 196

          #5
          Re: h4-01 on a mx-m550

          Have you checked the ac voltage to the mfp?

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          • ssbmi
            Technician
            • Oct 2013
            • 32

            #6
            Re: h4-01 on a mx-m550

            Originally posted by walterman
            Have you checked the ac voltage to the mfp?
            not yet, this problem has now turned into a intermitted problem since I last reset the thermostat, and cleared the code. I haven't been called back. But since I haven't fixed anything. its still open to me, might be a case of AM/FM

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            • faxman28
              Trusted Tech

              Site Contributor
              250+ Posts
              • Nov 2010
              • 436

              #7
              Re: h4-01 on a mx-m550

              Originally posted by ssbmi
              not yet, this problem has now turned into a intermitted problem since I last reset the thermostat, and cleared the code. I haven't been called back. But since I haven't fixed anything. its still open to me, might be a case of AM/FM
              the code is for low temp, if you have to reset the thermostat, the thermostat is probably faulty(normally when thermostat pops there should an Hxxx error for high temp). have had this issue several times, different fixes though , 1: take washers from thermostat mounting screws and put under thermostat to move it away from heat roller(metal plate that thermo mounts to maybe deformed.) 2: replace heat lamps (especially if they have rings or discoloration) 3: replace thermistors , 4:replace thermostat. from experience I usually do 1,2,and 3 together and the intermittent h4-01 go away.

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