Fireye NX6100 F30: Gas valve 2 proof of closure fault at shutdown, what to check?
I'm getting an F30 fault on our Fireye NX6100 controller. It happens right after shutdown, indicating a gas valve proof of closure issue for main valve 2. What should I check first?
The Fireye NX6100 F30 fault indicates that the proof-of-closure (POC) signal from gas main valve 2 did not behave as expected. This means the controller couldn't confirm the valve was closed when it should be, or the signal didn't change as the valve moved. This fault typically occurs before start-up or at shutdown.
Likely causes and checks
1Valve not closing fully or slowly
- Points to it
- The gas main valve 2 might not be closing completely or is closing too slowly, preventing the proof-of-closure switch from activating correctly.
- Check
- Inspect the valve actuator and seat for any obstructions or wear. Time the closing stroke of the valve to ensure it meets specifications.
2POC switch adjustment or wiring
- Points to it
- Even if the valve closes, the proof-of-closure switch might be misadjusted or have faulty wiring, preventing the signal from reaching the controller.
- Check
- Verify the adjustment of the POC switch on gas main valve 2. Check the wiring from the switch to the NX6100 controller input for continuity and proper connection.
Next check: Given the fault occurs at shutdown, start by inspecting the gas main valve 2 actuator and seat, and timing its closing stroke. If the valve appears to close correctly, then check the POC switch adjustment and its wiring.
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