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Old 11-12-2012, 11:06 AM   #16
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Carrier 58GSC Furnace won't start


The next step would normally be for your furnace to confirm that the pilot flame was lit. Is there a rectifyer flame rod in your pilot that needs to be cleaned?
Do you have a vent damper on your system that is supposed to be opening up?

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Old 11-12-2012, 04:18 PM   #17
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Carrier 58GSC Furnace won't start


Those are good questions for which I will need some time to investigate. The rectifyer flame rod appears to be clean (how clean is clean?), but I guess I will need to test the amperage to see if it is sufficient? Also, there is no damper for the vent flue. It looks like it is always open. Sunny Southern California...I have pictures that I am trying to send through Flickr.
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Old 11-12-2012, 07:24 PM   #18
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Carrier 58GSC Furnace won't start


If your pilot lit for 35 seconds, then I would be checking if the gas valve was then receiving 24Vac or not during that time.

Vent dampers are not just found on exhaust vents. Sometimes they are used on dampers that open up a sealed burner area to house air.!
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Old 11-12-2012, 08:40 PM   #19
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Carrier 58GSC Furnace won't start


You have an older style "3 wire pilot assy",Carriers great idea.The pilot flame heats up a bimetal strip, that closes a set of contacts.When they close power gets sent to gas valve.
I't is common for them to take awhile to kick burners on.I've seen some take a minute or more.When they are new usually fires in 30-45 sec.Sometimes if pilot orfice is dirty, the flame
wont heat bimetal enough.Then it just needs to be removed and cleaned.
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Old 11-12-2012, 10:24 PM   #20
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Carrier 58GSC Furnace won't start


Gents,
Thanks for all of your assistance in sharing your expertise. The burners did ignite after a minute of watching the pilot light burn. I did clean the assy and the flame was bigger. My next question is do I just replace the thermostat since jumping the thermostat connection worked by bridging from R to W ?
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Old 11-12-2012, 10:51 PM   #21
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Carrier 58GSC Furnace won't start


If the furnace only starts up when bridging R & W , then you have a wiring, connections or thermostat difficulty. Before trashing your thermostat first check if the wire connections at the thermostat are tight and no bared ends are touching any others. Confirm that the thermostat is set for heating. If none of that works, remove and cross the stat wires at the thermostat that go to R & W. If that doesn't get the furnace to fire, you have a problem with the stat wires between the stat and the furnace. If it does get the furnace to fire...change the stat.
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Old 11-13-2012, 02:11 PM   #22
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Carrier 58GSC Furnace won't start


How,
Many thanks. It was the white wire. All is well. Good tutorial and great, spot on advice from all. It's 83 degrees here today. Timing is everything.

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