Midmark M9/M11 Error Code C645 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 C645. 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
C645:VENT MODE PRESSURE HIGH
ITEMS NOT STERILE
UNPLUG / REPLUG UNIT
Absolute pressure inside chamber is greater than 0.7 psig (5 kPag) for longer than 10 minutes. (i.e. Vent mode is not complete)
Causes, Checks and Actions
Possible Cause 1: Maintenance not performed.
- Check: Verify weekly & monthly maintenance has been performed by customer. Refer to User Guide.
- Action: Perform monthly maintenance.
Possible Cause 2: Chamber filter clogged.
- Check: Check if chamber filter is clogged.
- Action: Clean / Replace filter. (Clean with Speed-Clean and brush)
M9 Mesh Vent Filter OEM available here
M11 Mesh Vent Filter OEM available here
Possible Cause 3: Vent valve.
- Check 1: Inspect vent valve. (Clean valve, stretch spring)
- Check 2: With the sterilizer in the Vent Mode… Perform: Vent Valve Testing (The valve is normally open, and should not be energized during the Vent mode).
- Action: Clean / Replace vent valve.
M9 Vent Valve Repair Kit OEM available here
M11 Vent Valve Repair Kit OEM available here
Possible Cause 4: 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 5: 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
Possible Cause 6: Blockage or malfunction in VistaCool system if used.
- Check A: Check for debris or blockage in the tubing / fittings to the VistaCool System.
- Action A: Clean / Replace as required.
- Check B: Check operation of In-Iine Thermal Sensor.
- Action B: Replace Thermal Regulator Wax Motor or Thermal Sensor.
- Check C: Check for weep hole in the manifold lid and threaded area on the tank of the VistaCool System.
- Action C: Drill hole in VistaCool manifold and threaded area on the tank.
Possible Cause 7: 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 8: 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.
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.