MSA ULTIMA X5000 Gas Monitor
MSA ULTIMA X5000 Gas Monitor Negative Supply Fault
The gas monitor negative power supply is out of range, causing the instrument to fault.
- Code
- Negative Supply Fault
- Name
- Negative Supply Fault
- Controller
- MSA ULTIMA X5000 Gas Monitor
- Type
- Power supply
- 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 November 4, 2026
How to fix it
Subscribers get:
- What to do next, in plain words
- What the manual says to do, and the page it is on
- Booking a live video call with Ben, a master booth technician ($250/hr, paid per call)
Questions about this code
What does MSA ULTIMA X5000 Gas Monitor Negative Supply Fault mean?
The gas monitor negative power supply is out of range, causing the instrument to fault.
Is MSA ULTIMA X5000 Gas Monitor Negative Supply Fault 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 MSA ULTIMA X5000 Gas Monitor Negative Supply Fault?
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 MSA ULTIMA X5000 Gas Monitor codes
General System Error · General System ErrorSensor Element Error · Sensor Element ErrorSupply Voltage Fault · Supply Voltage FaultLife and Health Fault · Life and Health FaultSensor Internal Fault · Sensor Internal FaultInternal Circuit Fault · Internal Circuit FaultParameter out of range · Parameter out of rangeSpan Calibration Fault · Span Calibration FaultZero Calibration Fault · Zero Calibration FaultParameter Fault (Sensor) · Parameter Fault (Sensor)
All 39 MSA ULTIMA X5000 Gas Monitor codes · Every fault code