furnace gas supply shuts off quickly

10-15-2010, 01:38 PM	#1
amyjamie Newbie   Join Date: Oct 2010 Posts: 2	furnace gas supply shuts off quickly Last week I had a 14 year old Trane furnace cleaned and checked out. First use since was this morning and it turns out that the gas shuts off a few seconds after ignition. I bypassed the thermal limit switch and get the same results.. The diagnostic light is a constatn flash. Any suggetions?

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10-15-2010, 02:10 PM	#2
kenmac HVAC / Plumbing   Join Date: Feb 2009 Posts: 1,801	furnace gas supply shuts off quickly Use some steel wool & clean flame sensor

10-15-2010, 05:00 PM	#3
amyjamie Newbie   Join Date: Oct 2010 Posts: 2	furnace gas supply shuts off quickly Thanks for quick response. Removed and cleaned, but still the same result. Is it possible that sensor bad? Have continuity from sensor to control

10-15-2010, 07:59 PM	#4
hvaclover Member     Join Date: Oct 2008 Location: Suburbs of Detroit Mi Posts: 3,702	furnace gas supply shuts off quickly never. ever. jump. out. a. safety. limit.- __________________ Just slow, not stupid.

10-15-2010, 10:37 PM	#5
newtech Member     Join Date: Mar 2009 Posts: 245	furnace gas supply shuts off quickly Have the company come back and re-check it... It's only been a week since they were there...

10-15-2010, 11:11 PM	#6
kenmac HVAC / Plumbing   Join Date: Feb 2009 Posts: 1,801	furnace gas supply shuts off quickly Quote: Originally Posted by amyjamie Thanks for quick response. Removed and cleaned, but still the same result. Is it possible that sensor bad? Have continuity from sensor to control Could be bad sensor, bad connection at board, bad connection at sensor,bad ground, bad board