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A Haas machine, depending on the vintage, has anywhere between one and eight analog sensors in various systems throughout the machine. All of these sensors share a common ground. A problem with one of these sensors could potentially affect the signal from all of them, making troubleshooting difficult. If you are troubleshooting a problem with any of these sensors, their cables or the Maincon/Mocon PCB follow these simple steps:

1. Look at the gauge page and identify the readings that look unreasonable. For example, if the spindle motor temperature [1] reads 0-degrees Fahrenheit and the shop is at 77-degrees this is not reasonable.
2. If one of these cables or sensors has a short-circuit. The gauge display will show several readings that are not reasonable.
3. Unplug each analog sensor one at a time. Look for the other gauge readings to return to something reasonable.
   

    Note: Some signals may take up to 30 seconds to react.

4. When you find the sensor that is causing the inaccurate readings you have most likely found the problem. Check the cable for damage. Check the sensor.
   

    Note: The cable or the sensor are more likely to be the cause of the problem than the Maincon / Mocon PCB.