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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a Carrier 9300TS that is giving me error codes 33 and

Customer Question

I have a Carrier 9300TS that is giving me error codes 33 and 13.
Submitted: 11 days ago.
Category: HVAC
Expert:  airheatman replied 11 days ago.

The 33 and 13 error codes ndicate an open high temp limit error.

There may be

several limits on the furnace.Blow describes locations:

PRI***** *****MIT

The pri***** *****mit control is located on the partition panel and monitors

heat exchanger compartment temperatures. It is a normally closed

(electrically), automatic reset, temperature-activated sensor.

The limit guards against the overheating as a result of insufficient

conditioned air passing over the heat exchanger.

AUXILIARY LIMIT

The auxiliary limit control(s) are located on or near the circulator

blower and monitors heat exchanger compartment temperatures.

They are a normally-closed (electrically), manual-reset, temperature

activated sensors. These limits guard against overheating as a

result of insufficient conditioned air passing over the heat exchanger.

VENT DRAFGAURD

These would be located on the draft hood if you have one on your furnace.

ROLLOUT LIMIT

The rollout limit controls are mounted on the burner/manifold assembly

and monitor the burner flame. They are normally-closed

(electrically), manual-reset, temperature-activated sensors. These

limits guard against burner flames not being properly drawn into the

heat exchanger.

Lets start with the most simple and easy. Look near burners for limits with a little button in center.It will push in to reset.If none are tripped we will go from here. Let me know if you have a multi meter for troubleshooting.

http://i.imgur.com/CGkB9sa.jpg

Customer: replied 11 days ago.
You helped us last year at this same time!! That tine was a code 32. Ok, let's do this!
Customer: replied 11 days ago.
Ok, the research I've done tells me that has two red wires coming from it and is on the side of my burner housing. I have pressed that several times.
Customer: replied 11 days ago.
I can clean cycle into things. All blowers SOUND like they're kicking on, but sonce it shuts down exactly four minutes in, I can't really feel heat.
Customer: replied 11 days ago.
Then everything shuts off, code flashes to 13 and I have to reset the thermostat to clean cycle it again. Can't find multimeter.
Expert:  airheatman replied 11 days ago.

Do you have a multi meter for troubleshooting?

Customer: replied 11 days ago.
I'm looking for it, but think it may be in toolbox in a car I don't have.
Expert:  airheatman replied 11 days ago.

That was my next question. Lets try bypassing each limit one at a time to see if we can make it work,If we find one that makes it work we will concentrate on that. Let me pull a wiring diagram and I will help you find them all.

Customer: replied 11 days ago.
Negative on MM.
Customer: replied 11 days ago.
I can pull the schematic you sent last year if need be.
Expert:  airheatman replied 11 days ago.

Follow the red wires from board to main limit, then to Flame rollouts bypassing each switch one at a time.

Then follow orange to aux limit on blower if you have one and to the draft limit if you have one doing same.

Customer: replied 11 days ago.
Not to sound like an idiot, but there's no way I can get this board out. Looks like a special tool is needed?
Expert:  airheatman replied 11 days ago.

No need to remove a board. You are just wanting to bypass each limit in that circuit by unplugging the two wires and connecting them together for a test.

http://i.imgur.com/WqmGzzO.png

Do this at each limit until you find one that makes furnace work and error go away.

Customer: replied 11 days ago.
Nvm. It's out.
Expert:  airheatman replied 11 days ago.

No need to remove a board. You are just wanting to bypass each limit in that circuit by unplugging the two wires and connecting them together for a test.

http://i.imgur.com/WqmGzzO.png

Do this at each limit until you find one that makes furnace work and error go away.

Customer: replied 11 days ago.
Ok, so where are the physical location of these wires if not on the board?
Customer: replied 11 days ago.
if we are testing the limit switch, you want me to disconnect the two red wires and do what, exactly?
Expert:  airheatman replied 11 days ago.

Locate each limit.Then one ta a time disconnect the two wires on limit and connect them together. Are you not able to see the links I am sending?

Click herehttp://i.imgur.com/WqmGzzO.png

Customer: replied 11 days ago.
I need a jumper (little metal connector pin) for that, correct? You have to realize the mechanical stuff is my arena and the electrical stuff is my husband, and I was just trying to get a head start for him. I know what a circuit is, but not really much beyond that. Having said that the limit wires do not easily disconnect from the plate, even with my small hands and arms I can't get back there. That is where you wanted me to start, correct?
Expert:  airheatman replied 11 days ago.

Yes you can use a straightened paper clip or a jumper wire

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