Which action would NOT be appropriate for a direct spark ignition system where the spark continues but the flames go out?

In a direct spark ignition system, when the spark continues but the flames go out, it indicates that there is an issue with the system that prevents proper combustion. The appropriate actions to address this situation should focus on components directly involved in the ignition and combustion process.

Choosing to check the gas flow to the pilot is not appropriate in this scenario because, if the spark is present, it suggests that the igniter is functioning to some extent. If there were an issue with gas flow, it would likely prevent the ignition from happening at all rather than allow a spark without sustained flames.

Inspecting the igniter is relevant because if the igniter is damaged or malfunctioning, it may create an insufficient flame or fail to maintain the flame after ignition. Testing the control module is also critical, as issues with the module could lead to improper functioning of the ignition system itself. Checking the thermostat wiring is beneficial in assessing whether the thermostat is sending the proper signals for operation, but it is less directly related to the immediate problem of the flame extinguishing after ignition.

Thus, while all the other options directly address possible causes of the issue, checking the gas flow to the pilot would not effectively resolve or diagnose the problem described, making it the least appropriate action in this context