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Sabrina BishopJul 30, 2025
What to do if sensor failure detected on Johnson Controls Control Systems?
- BBrooke MccannJul 30, 2025
If a sensor failure is detected and 'SNF' is displayed instead of a value on your Johnson Controls Control Systems device, the issue might stem from the sensor itself, its wiring, or the connections not opening or closing correctly. Here's what you can do: * First, check the integrity of the sensor wiring and connections to ensure they are secure and undamaged. * Next, with the sensor connected, measure the voltage between the sensor terminal (Sn-1, Sn-2, Sn-3) and the low-voltage common terminal. This will help you identify any electrical issues. * If the wiring and connections seem fine, the sensor might be faulty. Replace the sensor and recheck the voltage to see if the problem is resolved.
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