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80% trane furnace runs than on shut down it reignites the burner for a few seconds

in Gas Heating
I have a customer who has a 80% trane furnace it will run and heat the house but after the burner shuts down it will reignite the burner for a few seconds than shut down again. I have replaced the thermostat that didn't help. Any thoughts on what it could be?
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Comments
You can choose to do what you want, but you cannot choose the consequences.
Is the return big enough to give satisfactory air flow through the return? Is it a system with 100,000 worth of output air with a return of 8" round flex duct? I've seen that.
Wilson Services, Inc
Northampton, MA
www.wilsonph.com
[email protected]
Wilson Services, Inc
Northampton, MA
www.wilsonph.com
[email protected]
Supply and returns appropriate for the furnace? If so, high limit, and don't forget to check HE, crack is possible cause