It depends on configuration.
- With 24V power (Standard or WiFi), no light usually means no power, so check wiring and connections.
- On a WiFi model running on battery only, no light after startup can be normal while the sensor is still monitoring.
The sensor light guide covers the WiFi battery-only behavior.
- Confirm the Sensor is seated on the manifold's bayonet mount.
- Walk through the power and LED checks in the Sensor setup guide.
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