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cham44 02-13-2011 09:55 PM

Carrier 48SS018-060 shuts down when cold out - pics included
I have a Carrier model 48SS018-060. It got down to 16 degrees F the night it went out. I did the reset procedure and it worked fine for 4 days and cut off again, LED is flashing 8 times = internal control fault according to the manual. I reset it again and its working so far. The fan does NOT blow cold air when it goes out. The orange ignitor wire was touching the yellow flame sensor wire so I took care of that with a quick reroute. The guy who came out last year when my mom lived here told her that the burner was rusting and would need replacing soon. Of course that is what he told a woman so I take that with a grain of salt. It didn't look rusted to me but I didn't remove it and look inside of it. Besides, the burners are only $15/each and I only have two so not a big deal. Here are some pics.

unicursalhex 02-14-2011 01:57 AM

Not sure why your furnace is doing what its doing but I would have the heat exchanger inspected. Rust is a good indicator that the heat exchanger may be in bad shape.

beenthere 02-14-2011 04:15 AM

Your burners are rusting from the pics, and probably so is your heat exchanger.

cham44 02-14-2011 03:29 PM

I removed and cleaned the ignitor and flame sensor, reinstalled. Watched it startup a couple times. It lit no problem but I noticed that there appears to be a small flame between the 2 burners, yellow/blue then blue. I can't see back there but it would seem that there is a hole/crack back there. When they cool down I will get my handy extension mirror with LED attached and inspect it. But my question is would this cause the burners to not light occasionally? Or could I have installed the ignitor and/or flame sensor in such a manner that they interfere with the flow and cause this? They were just put in with screws, not like they were precision aligned or anything.

The heat exchanger shouldn't be too bad, my CO meter detected nothing and when the blower fan starts the flame does not change/jump/waver or change color.

beenthere 02-14-2011 04:03 PM

That flame is from the cross overs, and it is suppose to be there. Its how one burner lights the other.

My CO meter can read as low as 1 part per million CO. And has found a fair number of cracked heat exchangers i n homes where there CO detector never went off.

college A/C 02-14-2011 04:09 PM

Just a thought
have you cut off about 1/2 inch of the spark wire and reinserted it to see if the wire is going bad on the control board end. this will sometimes cause the unit not to light and lockout. Also make sure there isn't anything on the pin before you reinsert the cable.

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