ERROR CODE C633: HEATUP MODE

Midmark M9 & M11 C633: HEATUP MODE


When is the error code appearing?

The first step in determining the problem and it's solution is to take note of when the Error Code C633: HEATUP MODE is appearing. Once you know when the error code is appearing, scroll down & locate the proper chart for solutions

If The Autoclave Skips The FILL Mode

If, after you select a cycle and push start, the autoclave does not display filling, but goes directly into the heat up mode, then this is what you need to look for

Display/Symptom Cause What to Check Solution
C633: HEATUP MODE
PRESSURE LOW

ITEMS NOT STERILE

UNPLUG / REPLUG UNIT

This will occur if chamber pressure does not reach 1 psi within one minute after air valve closes; or if chamber pressure does not reach 4.93 psi within 25 minutes after starting the HEAT UP mode

 Tray rack / tray plate not installed properly. Inspect tray rack / tray plate for proper installation. (Angled end of tray plate must be toward the back of the chamber) Install tray rack / tray plate properly. Unplug sterilizer for 60 seconds before plugging back in.
Water Level Sensor malfunctioning Check the Water Level Sensor Disc to see if it is damp or wet Dry Water Level Sensor Disc with a Lint Free Cloth and try another cycle
While there is an electrical test you an perform to verify the water level sensor is malfunctioning, there is a more simple & direct way to test it Remove the Base Tray Plate & Tray Rack from the autoclave. Pour Distilled Water into the chamber until it touches the water level sensor & start another cycle. If it successfully completes the cycle, then you know the Water Level Sensor is bad & needs to be replaced

If The Autoclave Completes The FILL Cycle

If after selecting a cycle, the display reads FILLING and then advances to the heat up mode prior to giving you the C633: HEATUP MODE Error Code, then this is what you need to look for:

Display/Symptom Cause What to Check Solution
C633: HEATUP MODE
PRESSURE LOW

ITEMS NOT STERILE

UNPLUG / REPLUG UNIT

This will occur if chamber pressure does not reach 1 psi within one minute after air valve closes; or if chamber pressure does not reach 4.93 psi within 25 minutes after starting the HEAT UP mode

 Pressure leaking from chamber Check for pressure leaks. Click Here To See "How To Find Pressure Leaks" Repair or replace malfunctioning component
Temperature sensor malfunctioning Be sure there is nothing touching the temperature sensor. (Example: trays, pouches, cassettes, etc) Reposition items so nothing touches the temperature sensor
Check the temperature sensor probe for corrosion or residue Clean the temperature sensor with Mid-Clean™ Part #MIC143-6907 and distilled water
Perform Temperature Sensor Testing Follow instructions in test procedures
Sterilizer is not level Check surface where autoclave is located to make sure it is level Level with From Leveling Feet, or move the autoclave to a level surface
Heating element malfunctioning Test the Heating Element Replace The Heating Element if it fails the test

Click Here and scroll down the page for the instructions on testing the Midmark M9 autoclave

Click Here and scroll down the page for the instructions on testing the Midmark M11 autoclave
PC board malfunctioning Perform Pressure Transducer Voltage Test Follow instructions in test procedures

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