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im cam, a licenced diagnistic tech.
these purge valve are a duty cyle solenoid and can become sticky and intermittent. if they do not fully open or fully close, this will turn the light on.
you can test the valve and it will pass, than put it through some duty cycle tests and it can stick open or closed.
The only way to properly ceck this is with a smoke machine and working the purge valve .
if it is an intermittent issue, its probably a good idea to replace this valve as i find it has been the culprit 90% of the time.
how did your repair go?
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thanks and if you still need assistance , let me know!