Midmark M9/M11 Error Code C642 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 C642. 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.
And if you just want to talk to someone, call our Free Tech Support at 704-966-1650 Option 3.
Display/Symptom
C642: STERILIZE MODE PRESSURE HIGH
ITEMS NOT STERILE
PUSH STOP TO RESTART
Causes, Checks and Actions
Possible Cause 1: Defective Air Valve
- Check: Leaking or defective air valve. Perform: Air Valve Test Check for excessive steam coming thru condensing coil spout.
- Action: Clean / Replace air valve.
M9 Air Valve OEM available here
M11 Air Valve OEM available here
Possible Cause 2: Restricted Condensing Coil
- Check: Check for blockage in coil and assure weep hole is present and not obstructed.
- Action: Clear blockage / replace condensing coil.
Possible Cause 3: Pressure Tubing at Incorrect Angle
- Check: Check tubing for restrictions and ensure tubing is angled down and away from the PC Board.
- Action: Adjust pressure tubing to correct angle.
Midmark Pressure Tubing available here.
Possible Cause 4: Blockage or malfunction in VistaCool system if used.
- Check: Check for debris or blockage in the tubing / fittings to the VistaCool System.
- Action: Clean / Replace as required.
- Check: Check operation of In-Iine Thermal Sensor.
- Action: Replace Thermal Regulator Wax Motor or Thermal Sensor.
- Check: Check for weep hole in the manifold lid and threaded area on the tank of the VistaCool System.
- Action: Drill hole in VistaCool manifold and threaded area on the tank.
Possible Cause 5: The 90 degree elbow fitting(s) are not installed.
- Check: Check if the 90 degree elbow fitting(s) are installed on the tank.
- Action: Install the 90 degree elbow fitting(s).
Midmark 90 Degree Elbow Fitting available here.
Possible Cause 6: Tank is lower than the facility drain.
- Check: Check if tank is higher than the facility drain.
- Action: Install the tank higher than the facility drain.
Possible Cause 7: PC Board malfunctioning.
- Check 1: Perform: Heating Element Supply Voltage Test (With harness attached to leads should have line voltage in test mode)
- Check 2: Perform: Main PC Board Relay Test (Check TP1 & TP2 for an acceptable range: 10 to 14 VDC)
- Check 3: Perform: Main PC Board Pressure Transducer Voltage Test (Acceptable range: 4.0 to 6.0 VDC)
- Action: 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.