Midmark M9/M11 Error Code C674 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 C674. 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
C674: STERILIZE MODE PRESSURE OVERLIM
UNPLUG / REPLUG UNIT
Gauge pressure inside chamber is greater than 34.8 psig (240 kPa) during STERILIZE mode.
Causes, Checks and Actions
Possible Cause 1: Sterilizer Overloaded.
- Check: Check the size of the load. (Refer to User Guide)
- Action: Reduce Load Size
Possible Cause 2: Sterilizer is unlevel. (remove tray / trays)
- Check A: Verify support surface is level.
- Check B: Verify water on all sides of chamber are equal.
- Action: Place sterilizer on a level support surface.
Possible Cause 3: Temperature sensor malfunctioning.
- Check A: Check for residue build up on temperature sensor probe.
- Action A: Clean sensor probe with Speed-Clean, distilled water, and abrasive pad.
- Check B: Check that nothing is touching or crowding the temperature sensor. (Example: trays, pouches, cassettes, etc.)
- Action B: Reposition items so nothing touches or crowds the temperature sensor.
- Check C: Perform: Temperature Sensor Resistance Test. Allow sensor to cool to room temperature before testing. Acceptable range 1.07-1.1K Ω. Refer to: Temperature Sensor Resistance Test
- Action C: Replace temperature sensor.
M9 Temperature Sensor available here
M11 Temperature Sensor available here.
- Check D: Perform: Temperature Sensor Supply Voltage Test. Disconnect sensor harness from J12 on PC board. On pins 1 & 2 acceptable range is 4.0 – 6.0 VDC. Refer to: Temperature Sensor Supply Voltage Test
- Action D: Replace Main PC board.
M9 PC Board OEM available here
M11 PC Board 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.
M9/M11 Pressure Tubing kit 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.
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.