10 Year Old Carrier Mid Furnace With Standing Pilot - HVAC - DIY Chatroom Home Improvement Forum

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Old 09-30-2009, 09:59 PM   #1
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10 year old Carrier mid furnace with standing pilot

My son has a 10 year old Carrier mid furnace with a standing pilot. No parts book available. It has AC. Water dripped from the A frame and rusted the burners and clogged the pilot. I'm a licensed gasfitter. I cleaned the burners and put CLR in the pilot. Now the pilot works but it's still restricted. I replaced the thermocouple. It's working now, however the pilot isn't strong. What's the orifice size of this pilot? I'll drill it out to totally remove the obstruction.


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Old 10-01-2009, 12:20 PM   #2
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I don't know of any carrier furnace that had been made with a standing pilot within the last ten years. I would have to guess it has a three wire pilot assembly/switch. If you had to pour clr into the pilot to clean it, I would recommend replacing the pilot.


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Old 10-01-2009, 05:43 PM   #3
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Can you let me know what else i can check on my carrier furnace, that's not staying on. I have clean the flame sensor and the glow coil working fine, but after 60 seconds the flame blows out and the valves never get heated
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Old 10-01-2009, 06:16 PM   #4
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Skip, Carrier made a cheap builders grade GFA mid unit with a standing pilot. (And a Payne and Bryant clone). For $2 more it could have had a HSI, go figure.

Bryan that orifice is ultra tiny as it is a micropilot type burner and obsolete. Not sure what the size was. It is usually stamped on the side of the orifice and you may see it with a strong magnifying glass.

Last edited by yuri; 10-01-2009 at 06:21 PM.
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