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Old 12-01-2010, 05:17 PM   #1
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Carrier gas pack won't ignite, pressure switch doesn't close


Don't know the model number but its an 18 year old, 3 ton package system that I'm going to replace soon. System was working fine, then yesterday found fan running but no heat. Found fan wheel had rusted and broken off of the inducer motor, replaced fan wheel but still won't ignite because pressure switch isn't closing. If I jump pressure switch, burner will ignite but soon shuts down because roll out switch opens (didn't start without access panel in place). Seems to be air flow problem but can't find anything clogged, cracked, broken or otherwise degraded and it was working fine a couple of days ago. The new fan wheel is correctly installed and the inducer motor seems to be working fine. Any thoughts? Thanks!

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Old 12-01-2010, 06:46 PM   #2
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Carrier gas pack won't ignite, pressure switch doesn't close


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Originally Posted by TNFrank View Post
Don't know the model number but its an 18 year old, 3 ton package system that I'm going to replace soon. System was working fine, then yesterday found fan running but no heat. Found fan wheel had rusted and broken off of the inducer motor, replaced fan wheel but still won't ignite because pressure switch isn't closing. If I jump pressure switch, burner will ignite but soon shuts down because roll out switch opens (didn't start without access panel in place). Seems to be air flow problem but can't find anything clogged, cracked, broken or otherwise degraded and it was working fine a couple of days ago. The new fan wheel is correctly installed and the inducer motor seems to be working fine. Any thoughts? Thanks!


18 yr old carrier probably cracked or hole rusted through somewhere

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Old 12-01-2010, 08:39 PM   #3
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Carrier gas pack won't ignite, pressure switch doesn't close


big chance the heat exchanger has a hole in it. or something is blocking the vent. there is a reason why the p/s is not closing
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Old 12-02-2010, 04:42 PM   #4
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Carrier gas pack won't ignite, pressure switch doesn't close


Thanks guys, its clearly time for a new one!
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