Temperature controllers
FutureDesign MCT4 Multi-Loop Controller / HMI fault codes
What all 8 FutureDesign MCT4 Multi-Loop Controller / HMI fault codes mean, in plain words, with a risk grade for each. These come from the manufacturer's own manual. The fix for each one is in WERCS Diagnose.
Get the fixes · plans from $49/moUpdated July 22, 2026
| Code | What it means | Risk |
|---|---|---|
| #4 | "tagname" outputs 1 and 2 incorrectly configured. The first and second outputs of the named control are in an invalid configuration, preventing proper operation. | GREEN |
| #26 | Auto tune failed for "tagname". The auto tune process failed to execute for the named control loop. | GREEN |
| #29 | "tagname" EEPROM failure The internal memory in the named loop or limit control failed, preventing the system from operating correctly. | YELLOW |
| #30 | "tagname" cold junction failure The cold junction compensation in the named loop or limit control failed, stopping accurate temperature readings. | YELLOW |
| #40 | "tagname" A to D converter failure The analog to digital converter in the named loop has failed, which terminates any running ramp or soak process. | YELLOW |
| COMM_ERROR | Communications error with "tagname". Check cable. A communications error occurred with the named control, causing a loss of connection to the system. | GREEN |
| DATA_FILE_SD | Data file error. SD card full or missing. A data file error occurred because the memory card is full or missing, stopping data logging. | GREEN |
| SENSOR_BREAK | "tagname" sensor break A sensor break was detected on the named control, which terminates any running ramp or soak process. | YELLOW |
Every code comes from the manufacturer's own manual. Subscribers see which manual and page.