FAQ - My unit is rumbling when it’s trying to fire.
Article Number: 58 | Rating: Unrated | Last Updated: Mon, Oct 6, 2014 4:42 PM
This can be a result of a blockage in the flue, incorrect vent sizing, incorrect vent length, and/or incorrect gas pressure/gas type. If all of these match the requirements in the installation manual and there is still a rumbling sound, please call Technical Service at 866-766-7489.
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