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My carrier furnace is not turning on. Thermidistat is blank.

My carrier furnace is...

My carrier furnace is not turning on. Thermidistat is blank. Error codes is 33.

Contractor's Assistant: How old is the appliance? Have you gotten error messages before?

16 years old. Got error message 15 years ago, runnng perfect since then.

Contractor's Assistant: Do you plan on doing the work yourself?

Yes.

Contractor's Assistant: Anything else we should know to help you best?

Model number 58mvp060

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Answered in 3 minutes by:
1/21/2018
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 23,038
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Verified

Hello,

My name is Billy. Is the main blower running during 33 code?

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Customer reply replied 4 months ago
If I turn the main power off, then on. The blower spins up.
Customer reply replied 4 months ago
The 33 then resumes flashing.

Thank you....do you mind removing the front door and doing a small test for me?

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Customer reply replied 4 months ago
No problem. Front door off.

See HERE

looking for a rectangle flat plate with 2 wires attached. Let me know if you see what I refer to

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Customer reply replied 4 months ago
THere is a box at the top with 2 red wires on the right side.

Can you take a pic and post here? Then I will draw exactly what we need to check in 2 different places.

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Customer reply replied 4 months ago
working on moving pic

great...just a moment while I make notes

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first task HERE...working on next

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Customer reply replied 4 months ago
Pressed.
Customer reply replied 4 months ago
It clicked.

Is code 33 now gone?

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Customer reply replied 4 months ago
Upper motor spinning. No flashing codes. Flame on.
Customer reply replied 4 months ago
Thermidistat on.

Ok,

This trip can be a nuisance trip.....wind, critter was in exhaust, etc...or it can be an issue with the heat exchanger itself. If it starts tripping regularly you will need to call for service.

Billy

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Customer reply replied 4 months ago
I think that we are good.

Great news...

Just rate service ( 5 star system) to close.

Have a great evening

Billy

BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 23,038
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Verified
BillyHvac and 87 other HVAC Specialists are ready to help you
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Customer reply replied 3 months ago
The furnace ran for a few days. It then gave a different code, 42. I replaced the draft inducer motor/fan assembly.
If I reset the rollout switch, the furnace will start consistently, then shut down giving a error code 33.
Both the draft inducer and main blower spin. The rollout switch trips and flame box is hot. Is there anything more that I can check myself?
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,024
Experience: Furnace, A/C and heat pump specialist.
Verified

Are you having to reset the rollout every time before it will restart?

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Customer reply replied 3 months ago
It seems that the main blower is not going to full speed, then the rollout switch overheats opens. The main blower stays on the low setting.
Customer reply replied 3 months ago
I ran a snake through the intake and exhaust pvc pipes outside. Was able to push 3 feet of snake in with no snags.

OK the rollout will only open if the flame is rolling and and touching it or if chamber is getting extremely too hot.

If blower is not going full speed weneed to find out why.Do you have a capacitance meter to check capacitance on the fan run capacitor?

https://www.youtube.com/watch?v=kdFIARakavk

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Customer reply replied 3 months ago
Definitely on my desk at work. Let me see if I have on in the house.

OK we will go from there.

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Customer reply replied 3 months ago
Ok. I called a computer tech at work to look at my multimeter. No farads on multimeter. Tech suggested starting furnace, switch furnace off and turn fan(blower) on manually. I tried that and the fan/blower went on full.

OK fan has two different speeds.Low speed for fan and high speed in COOL or fan on position so that really does not tell you anything.

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Low speed for Heat it should say

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Customer reply replied 3 months ago
The fan is coming on low and high. Does that mean the start capacitor is good?

If fan is running as fast as it should (approx. 800 to 1000 cfms in heat and 1200 to 1600 cfms in cool) capacitor is not the problem.

So are you saying in heat mode your air at registers feels normal or feels lower than normal

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Customer reply replied 3 months ago
I think that the furnace has 2 fan speeds. It only uses high if the differential from ambient to thermostat setting is large, like 5 degrees. It is on high in the morning when I wake-up as I keep it set low while asleep.
Customer reply replied 3 months ago
I just ran the on board diagnostic. Blower and inducer checked out at both high and low settings during diagnostic (code 11).
Customer reply replied 3 months ago
What should I be checking now?

If flame is not coming out of chamber, replace the rollouts

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Customer reply replied 3 months ago
Just replaced the rollout switch. No change.

OK if you replaced rollouts there has to either be another limit somewhere on the furnace that is opening or your board is failing. Do you have a multi meter to check the limit circuit?

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Customer reply replied 3 months ago
I have a multi-meter with volts, amps and resistance, but not capacitance.

Lets check continuity on the limit circuit

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I will get a manual and look at wiring to tell you how to do this.

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Customer reply replied 3 months ago
Here is a link to the manual to my furnace, if it helps: https://www.manualslib.com/download/558737/Carrier-58mvp.html

Have the manual but just realized you have already accepted an answer from a different technician.We work on commission so he has already been paid.The only way for me to be compensated for my time since you have rated other expert's answer is to offer you an additional troubleshooting service.The fee is 28 dollars.If you want me to continue just let me know and I will present the offer.Otherwise I can opt out and hopefully previous expert will provide follow up.

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Customer reply replied 3 months ago
I signed up for the subscription today. Not sure how that factors in.
Customer reply replied 3 months ago
i did post a new question, so this one would not need to be continued.

I thought so to but scrolling up I see it now shows as original question and rated already.so someone flagged it as a duplicate. I usually do not see other experts questions unless they opt out.

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Customer reply replied 3 months ago
What should I do then, considering that I signed up for a subscription today?

ASk a new question and I will reply and we will go from here. No one should be ale to flag it.

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Customer reply replied 3 months ago
60 seconds.

OK

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BillyHvac
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 23,038
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