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natural gas furnace help

So full disclosure, I am an HVAC service tech. 6 years experience but always learning. My mom's trane natural gas furnace goes out. Getting error code that says out on retries. System cycles through its normal startup procedure, and gets to where the ignitor glows, control board clicks to send

intermittent fail to fire

Question from user Winter_Wookie at hvacadvice at reddit.com. Answer: Adjusting the gas valve didnt work because you fail to understand why its failing. Its not carrying the flame over. You need to clean out the entire unit with compressed air to get the dust out of the flame carriers. Answer