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My Carrier 58MCB140-20 is producing no heat. The blower goes…

My Carrier 58MCB140-20 is...

My Carrier 58MCB140-20 is producing no heat. The blower goes on for just a few minutes.

Contractor's Assistant: Did you double-check the thermostat's settings? And what about the filters?

I replaced the filter 10 days ago, and I've reprogrammed the thermostat. It had been set to "hold."

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

No, but it's late. I may need to call someone tomorrow. I don't see a pilot light--should I?

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

I don't see a pilot light. Should I?

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Answered in 1 minute by:
10/24/2017
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,181
Experience: Furnace, A/C and heat pump specialist.
Verified

There is no pilot.It lights electronically. Go to furnace an jump the Rand w on furnace board and let me know what comes on if anything

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Customer reply replied 8 months ago
What is the Rand W?
Customer reply replied 8 months ago
I’ve got the R and W wires. How can I “jump” them? The connections are a bit different from your diagram. There is no screw connection.
Customer reply replied 8 months ago
The wires just plug in...

Do you have a pic you can attach? You can use needle nose pliers to jump

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That is your zone control.Look in furnace you gave me model on

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Bottom panel of furnace you will see the board I sent pic of

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One more panel

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Yep jump R to W and hold door button in to see if furnace will come on

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Customer reply replied 8 months ago
That turned the blower on. But just until I let go of the door button.

Keep button in.Allow blower to stop.The see if inducer fan starts and furnace fires.Keep button in

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Customer reply replied 8 months ago
Furnace fired. I’m still holding door button in.

OK we have now determined problem is nt with furnace.It is with thermostat or that zone panel you shoed me.Do you have a multi meter for testing voltage?

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Customer reply replied 8 months ago
No.Could it be the programming of the thermostat?

Yes. Lets close up furnace and go to thermostat and do same.Jump R to W

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Customer reply replied 8 months ago
Blower was on for a few minutes, now off. I’m at the thermostat

Jump R and W

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Yes remove front to expose wires

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Did you remove cover>No pic

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OK tis is a two wire so no W here. e would need a meter to troubleshoot to see if we have 24 at the red and blue R and C at that zone cotroller.

you can get an inexpensive one at Walmart for about 15 bucks if you would like to troubleshoot and I would be happy to guide you.

http://www.walmart.com/ip/Innova-3300-Equus-3300-Hands-free-Digital-Multimeter/14644665

Otherwise from ere you will need to get a tech on site

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Customer reply replied 8 months ago
Okay. I’ll get one tomorrow, and I’ll get back in touch.At least I now know that it’s a thermostat issue. Thanks.
Customer reply replied 8 months ago
Check between R and C—on which panel? The thermostat control has no R and C wires.Between the R and C wires on the Zone Control, or on the furnace?
Customer reply replied 8 months ago
Got it. Thanks!

Thanks for letting me work with you

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airheatman
airheatman
airheatman, HVAC Technician
Category: HVAC
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