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Billy
Billy, HVAC Technician
Category: HVAC
Satisfied Customers: 19945
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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I Carrier weathermaker 9200 and its only blowing cold air,

Customer Question

I Carrier weathermaker 9200 and its only blowing cold air, and the led is blinking 33. I replaced the filter. Still nothing. Pulled out the thermocouple and cleaned it. still no go. I bypassed the high temp sensor and thermo still didn't glow. any suggestions?
Submitted: 2 years ago.
Category: HVAC
Expert:  M Oglesby replied 2 years ago.

M Oglesby :

ONe moment please

Customer:

ok

M Oglesby :

Ok I am back

Customer:

alright

M Oglesby :

Look on the back of the furnace panels and tell me what the 33 led troubleshooting code is indicating?

Customer:

33 LIMIT OR FLAME ROLL-OUT SWITCH IS OPEN - If open longer than three minutes, code
changes to #13. Check for:
- Defective blower motor or start capacitor. - Dirty filter or restricted duct system.
- Loose blower wheel. - Defective switch or connections.
- Inadequate Combustion air supply Flame Roll-out Switch or fuse link.
- Open Flame Roll-out switch,or fuse link. Manual reset or replace.

M Oglesby :

Is the fan working?

Customer:

yes

M Oglesby :

The igniter is not glowing?

Customer:

not at all, I pulled it and cleaned it and reinstalled it

Customer:

still nothing

M Oglesby :

You cleaned the igniter?

M Oglesby :

You cannot clean a igniter.

Customer:

well i sanded it

M Oglesby :

Use a voltmeter to see if the igniter is receiving 120 volts.

Customer:

lightly

M Oglesby :

I think you are referring to the flame sensor rod.

Customer:

what ever piece glows bright red

Customer:

when it works properly

M Oglesby :

Yes that is the igniter

M Oglesby :

Do yyou have a volt meter?

Customer:

yep

M Oglesby :

Check to see if the igniter is receiving 120 volts.

Customer:

k b right back

Customer:

sry mine was dead have to get the neighbors brb

Customer:

no dice on the meter. I dont know why mine is dead . i left him a voicemail. and other trouble shooting we can do?

Expert:  Billy replied 2 years ago.

You wont have power to the ignitor on code 33.

 

As you already posted it is a limit or rollout switch tripped.

 

When this happens no power goes to ignitor.

 

Check the roll out switches around the burner box and press the center to see if tripped.

 

Then we can proceed further if you wish.

 

No power goes to ignitor while this 33 code is present.

 

 

Billy, HVAC Technician
Category: HVAC
Satisfied Customers: 19945
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Billy and 2 other HVAC Specialists are ready to help you
Customer: replied 2 years ago.
i got the volt meter working
Expert:  Billy replied 2 years ago.

have you checked the roll out switches?

 

 

Customer: replied 2 years ago.
no where do i do that?
Expert:  Billy replied 2 years ago.

There is a box around the burners....then there are small switches on the sides and top...these sense heat directly at the burners

 

If you have the model number of your 9200 I can send diagram or pic

 

 

Customer: replied 2 years ago.
there is one switch near the burners. i bypassed it and the igniter still will not glow

Expert:  Billy replied 2 years ago.

 

Now..if you have the model number I can be very specific as to what to do where...

 

so please get that from label inside furnace.

 

Does this unit blow air up or down?

 

 

Customer: replied 2 years ago.
58mx082-12
Expert:  Billy replied 2 years ago.

see page 4 here for the side view of the rollout. There is usually more than one so follow the wires...

 

How did you bypass the limit attached to the front wall behind gas valve?

 

 

Customer: replied 2 years ago.
Sry its was 58MX080-12
Expert:  Billy replied 2 years ago.

Ok,

 

see page 4 here for the side view of the rollout. There is usually more than one so follow the wires...

 

http://www.docs.hvacpartners.com/idc/groups/public/documents/techlit/58mxa-2sm.pdf

 

 

How did you bypass the limit attached to the front wall behind gas valve?

 

Customer: replied 2 years ago.
I bypassed a switch/ temp sensor with w wire jumper
Expert:  Billy replied 2 years ago.

Is this what you bypassed

 

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Customer: replied 2 years ago.
yes diferent style but same function
Expert:  Billy replied 2 years ago.

 

Great...is there a limit in the blower section if this is installed as downflow or horizontal?

 

and how many rollouts did you test?

 

 

 

 

Customer: replied 2 years ago.
upflow, and no clue what a rollout is
Expert:  Billy replied 2 years ago.

no problem

 

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will be on side of the burner enclosure

Customer: replied 2 years ago.
thats the one i bypassed
Expert:  Billy replied 2 years ago.
There should be more than one...follow the wires from that one to the other
Customer: replied 2 years ago.
nope thats the only one. the red wires go from that piece all the way to a circutboard
Expert:  Billy replied 2 years ago.

does a red wire go to the limit on front wall and then from there to the roll out?

 

so basically a red wire leaves the plug on the circuit board, goes to limit and then roll out and back to plug?

 

 

Customer: replied 2 years ago.
They go from the board to the plug, im not getting 120v at the igniter

Expert:  Billy replied 2 years ago.

Take those 2 wires where they leave the plug and run a sewing needle in the center of both wires..this bypasses the limits.

 

You will not get 120 v to ignitor until 33 code goes away.

Customer: replied 2 years ago.
i c, when will that code go away?
Expert:  Billy replied 2 years ago.
it would go away right after the circuit closes. is blower running nonstop?
Customer: replied 2 years ago.
yes blower is running nonstop
Expert:  Billy replied 2 years ago.

 

Yep....run that needle through the 2 wires and make sure the needle doesnt touch the furnace cabinet...do this with power off..then turn back on..tell me code changes

 

 

Customer: replied 2 years ago.
still 33
Expert:  Billy replied 2 years ago.

 

Thank you.

 

You have a bad circuit board.

 

That circuit sends power (24v) out on the one red wire to limit..through roll outs and back to plug. If that circuit stays open we have a 33 code.

 

The board is not sending 24 to the limits.

 

If you have your meter ready...put one lead one the limit switch and other to ground...

 

But it looks like the board is not sending 24v or is not recognizing when it comes back...unplug the plug and reseat it...if it still codes 33 then the board is bad.

 

 

Customer: replied 2 years ago.
26.8v
Expert:  Billy replied 2 years ago.

 

 

Ok,

 

this proves the board is not recognizing the voltage when it returns to plug.

 

This based on code 33 (open limit) with the series jumped out...the board is defective.

 

Not that it matters...but I changed over 500 of these particular circuit boards for numerous reasons...

 

This one is failure to accept 24v from safety circuit. The board thinks the limit is open even though we have it bypassed.

 

 

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