FutureDesign MCT4 Multi-Loop Controller / HMI
FutureDesign MCT4 Multi-Loop Controller / HMI code #30: "tagname" cold junction failure
The cold junction compensation in the named loop or limit control failed, stopping accurate temperature readings.
- Code
- #30
- Name
- "tagname" cold junction failure
- Controller
- FutureDesign MCT4 Multi-Loop Controller / HMI
- Type
- Sensor fault
- What it does
- Fault: the equipment trips and stops
- Risk
- YELLOW Booth plays by its own rules
- Reset
- Clears on its own when the condition goes away
- Source
- The manufacturer's manual (subscribers see which manual and page)
Updated July 22, 2026
How to fix it
Subscribers get:
- What to do next, in plain words
- Which manufacturer manual it comes from, linked
- The 1 common cause listed for this code
- The step by step check for this problem, one check at a time
- Booking a live video call with Ben, a master booth technician ($250/hr, paid per call)
Questions about this code
What does FutureDesign MCT4 Multi-Loop Controller / HMI code #30 mean?
The cold junction compensation in the named loop or limit control failed, stopping accurate temperature readings.
Is FutureDesign MCT4 Multi-Loop Controller / HMI code #30 dangerous?
It is graded yellow: not hard, but a booth does it differently than the gear most techs know, so follow the checks in order.
How do I fix FutureDesign MCT4 Multi-Loop Controller / HMI code #30?
The manual's fix and the step by step check for this code are in WERCS Diagnose, plans from $49 a month. For help right now, WERCS answers 24/7 at (877) 489-3727.
Other FutureDesign MCT4 Multi-Loop Controller / HMI codes
#4 · "tagname" outputs 1 and 2 incorrectly co#26 · Auto tune failed for "tagname".#29 · "tagname" EEPROM failure#40 · "tagname" A to D converter failureCOMM_ERROR · Communications error with "tagname". CheDATA_FILE_SD · Data file error. SD card full or missingSENSOR_BREAK · "tagname" sensor break
All 8 FutureDesign MCT4 Multi-Loop Controller / HMI codes · Every fault code