We have an Empire natural gas, gravity vented wall furnace (GWT-25-2) with a simple thermostat. When I move up the thermostat to start it, it gives 2 rather loud "puffs". It's like the pilot ignites the burner twice or in 2 different places. Sometimes the 2nd puff blows out the pilot light and I have to relight it.
What causes this? How fixed? I'd like to know something in advance of calling someone to look at it.
What causes this? How fixed? I'd like to know something in advance of calling someone to look at it.
source https://hvac-talk.com/vbb/showthread.php?2226464-Loud-Double-quot-Puff-quot-When-Gas-Wall-Furnace-Starts-Sometimes-blows-pilot-out&goto=newpost
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