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<blockquote data-quote="ConstitutionCowboy" data-source="post: 4198888" data-attributes="member: 745">Check and see if it is the &quot;vacuum sensor&quot; that detects if your draft initiator is working. If it doesn&#039;t sense the lower pressure in the combustion chamber, it won&#039;t turn on the gas. Mine went out about two months ago. It has a rubber / fabric diaphragm in it that wears out or just deteriorates and leaks. The flame in my furnace would click on and off at first, then stay lit. Finally, it wouldn&#039;t come on at all. The draft initiator would start running but the defective sensor wouldn&#039;t allow the gas to turn on. The sensor is a relatively inexpensive part, but it is essential. The draft initiator keeps the pressure inside the combustion chamber of the furnace lower than the air pressure in the rest of the furnace preventing any carbon monoxide from entering the air being heated and circulated. The pressure sensor detects the lower pressure and allows the flame to ignite.The sensor also has a set of contacts in it that can get &#039;burnt&#039; like the points in the old style car engine ignition distributors.Woody</blockquote>

[QUOTE="ConstitutionCowboy, post: 4198888, member: 745"] Check and see if it is the "vacuum sensor" that detects if your draft initiator is working. If it doesn't sense the lower pressure in the combustion chamber, it won't turn on the gas. Mine went out about two months ago. It has a rubber / fabric diaphragm in it that wears out or just deteriorates and leaks. The flame in my furnace would click on and off at first, then stay lit. Finally, it wouldn't come on at all. The draft initiator would start running but the defective sensor wouldn't allow the gas to turn on. The sensor is a relatively inexpensive part, but it is essential. The draft initiator keeps the pressure inside the combustion chamber of the furnace lower than the air pressure in the rest of the furnace preventing any carbon monoxide from entering the air being heated and circulated. The pressure sensor detects the lower pressure and allows the flame to ignite. The sensor also has a set of contacts in it that can get 'burnt' like the points in the old style car engine ignition distributors. Woody [/QUOTE]

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