This article explains the possible causes and solutions to a Midmark M9-M11 New Style autoclave Error Code C385.

Midmark M9/M11 Error Code C385 Leave a comment

In this article, we’re going to explain one of the many error codes that can affect your Midmark M9/Midmark M11 autoclave. This article will focus specifically on error code C385. We’ll tell you about the problem, what displays when the error occurs, its possible causes, and the course of action to take to resolve said error.


However if you’re more of a visual learner we have a video on this error code available here. 





Causes, Checks and Actions

Possible Cause 1: Door Switch/PC Board malfunctioning.

Note: Test switch with the door OPEN and Closed. 


Check 1: Perform: Door Switch Continuity Test. With door closed, disconnect door switch wires from J1 & J2 of Main PC board. Place meter probes on door switch wires. If Continuity is not present replace door switch. Refer to: Door Switch Continuity Test

Action 1: Replace door switch.

Midmark Door Switch available here. 

  • Check 2: Check supply voltage from PC board. (Line voltage 120 or 230 VAC) Refer to: Door Switch Supply Voltage Test
  • Action 2: Replace main PC board.

M9 PC Board OEM available here

M11 PC Board OEM available here

As always if you have any questions about this process or anything else please feel free to contact us and take advantage of our “FREE TECH SUPPORT.”

We also offer FREE VIRTUAL TECH SUPPORT to “See and Talk” with a “Real Time Live Technician” for any problems you may be in need of help with.

You can also use our “FREE MAINTENANCE PROGRAM”. Take the guesswork and worrying about what unit is due for maintenance and which maintenance cycle it is time for. We will keep track of all your autoclaves and let you know when it’s time for anything.

The Midmark M9 autoclave is available here. 

We also have the Midmark M11 autoclave here. 

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