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Furnace is not working. Giving error code 13.

I have a Payne PG8JAA...
I have a Payne PG8JAA furnace that is sending code 13 and then turning into code 33 after about 5 minutes.
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11/20/2009
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,767
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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Did resetting the switches on the burners do anything?
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Customer reply replied 8 years ago

No, it did not. The main fan just keeps running. In case you didn't already know:
Code 13: Limit Circuit Lockout
Code 33: Limit Circuit Fault
The instructions said that there would be an auto reset after it goes to code 33, so I waited the 3 hours and nothing happened.
I've also checked all the filters and the vents and everything is clean and clear. The unit is only a year old, and as you can tell from the images I've attached, it is very clean.

http://img25.imageshack.us/i/dsc00989f.jpg/
http://img23.imageshack.us/i/dsc00991mv.jpg/
http://img97.imageshack.us/i/dsc00992nr.jpg/

Behind the gas valve on the front wall is a 2"X4" rectangle plate with 2 wires attached to it. Turn power off and remove the 2 screws holding the plate in and remove the switch. Tap on the end a couple times and reinstall. This is a limit that is supposed to reset itself but can get stuck. Try that and get back to me with results

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Customer reply replied 8 years ago

Okay.... This isn't a switch, unless I removed the wrong thing. Please verify...
http://img39.imageshack.us/img39/7985/dsc00993h.jpg

Ok that is a limit. Is this a down flow?

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Customer reply replied 8 years ago

Yes it a down flow... Down flow meaning the heated air goes into the slab of the house and the intake is coming from the top...

That means you may have a limit in the blower section
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Customer reply replied 8 years ago

While I was waiting for your response, I took the cover off of the blower section and was looking for something similar to what the other switches looked like; and could not find anything.
http://img695.imageshack.us/img695/7809/dsc00995o.jpg
http://img36.imageshack.us/img36/14/dsc00994ni.jpg

Ok, lets get going on some elimination. Tape the safety door switch down. The code should start. Remove the 2 wires from the limit you took off earlier, don't let these touch ground or the 3 amp fuse on the circuit board will blow. Touch the metal ends of the 2 wires together and see if code stops. If not, put back on switch and try same thing with roll-outs.

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Customer reply replied 8 years ago

Okay. I took the wires off the limiter (image I sent you before) and put a paper clip in between them. Powered up the unit and it works now. I have ignition and everything is operating normal (solid red light). So I have a bad limiter. Where would I be able to get a replacement and about how much do they cost?

You can buy the online for around 45-50 dollars. You could probably pick one up at a local heating shop for less than that. That limit is very common in many furnaces and will be a regular stock item. Jut take that one with you. You can try for temporary fix to hold a flame on the switch for 20 seconds and then put it in the freezer for 2-3 minutes. That sometimes un-sticks them, but I still think you should get a new one.

BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,767
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Customer reply replied 8 years ago
Excellent. Thank you very much!!

Actually I thank you. You have shown great patience and I appreciate it greatly.

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BillyHvac
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