Fireye NX6100 F42: Gas Valve Leak Test Failed, what to check?
Our Fireye NX6100 burner controller is throwing an F42 fault during startup. It happens when the gas valve leak test runs. What should I check first?
The Fireye NX6100 controller's F42 fault indicates a problem with the gas safety shutoff valve leak test. This test runs during startup (Status 03-09) and checks for pressure changes between the gas valves. The fault means the pressure didn't behave as expected, suggesting a leaking valve, a valve not opening, or incorrect test parameters.
Likely causes and checks
1Leaking valve seat
- Points to it
- Either the upstream or downstream gas safety shutoff valve seat is leaking, causing pressure to decay or build in the test section.
- Check
- Observe if the fault consistently occurs at the same step. Have a qualified technician perform a tightness test on the valves according to the manufacturer's procedure.
2Low or unstable supply pressure
- Points to it
- The gas supply pressure is either too low or fluctuates, especially when other equipment is drawing gas, leading to intermittent test failures.
- Check
- Monitor the gas supply pressure during the leak test and compare it against the nominal pressure configured in the controller.
3Incorrect test parameters
- Points to it
- The valve proving option parameters (nominal pressure, test volume, leak rate) are set incorrectly, particularly after a new installation or gas train modification.
- Check
- Verify that Option 10.1 is set correctly and review the valve-proving option parameters, including the gas pressure change limit (EK53).
Next check: First, observe if the F42 fault consistently occurs at the same step during the startup sequence. This often points to a leaking valve seat. If it's intermittent, check the gas supply pressure during the test.
Related questions
Describe the fault or upload a photo, and InduQT checks it against the manufacturer manuals. Share the result here when it helps someone else.