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My thermostat is blank today. AC was not blowing cold air

Customer Question
just blowing air and the...
My thermostat is blank today. AC was not blowing cold air just blowing air and the outside unit was just buzzing as if it could not kick on.
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: the hermostat settings were correct. Now the thermostat is blank. Filters are fine
JA: Do you plan on doing the work yourself?
Customer: Only if it's an easy fix.
JA: Anything else we should know to help you best?
Customer: That's about it. It's a trane xr12 unit outside
Submitted: 5 months ago.Category: HVAC
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Answered in 1 hour by:
6/11/2017
HVAC Technician: Regan Land, HVAC Technician replied 5 months ago
Regan Land
Regan Land, HVAC Technician
Category: HVAC
Satisfied Customers: 707
Experience: Over 20 years of experience, NATE Certified, Licensed HVAC Contractor, Certified IAQ Specialist
Verified

Hello and welcome to JustAnswer - My name is ***** ***** I'll be happy to assist you. Is the indoor unit easily accessible?

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Customer reply replied 5 months ago
it is.
HVAC Technician: Regan Land, HVAC Technician replied 5 months ago

Okay good - is it in a closet, basement, attic? And is the unit in a vertical position or laying on its side?

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Customer reply replied 5 months ago
Is the start capacitor hard to replace? And how do I know which part to get? It's a trane XR 12. Model number 2TTR2030A1000AA
Customer reply replied 5 months ago
It's in the basement And is vertical
HVAC Technician: Regan Land, HVAC Technician replied 5 months ago

Start capacitors are easy to replace, but wouldn't cause the thermostat to go blank. Let's start by taking a look around the indoor unit for signs of water. There may be a small pan that has a float switch that may have water in it, or the floatswitch may be on the drain line. Let me know if you find anything. Do you have a multi-meter and feel comfortable using it?

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Customer reply replied 5 months ago
I have the thermostat working again but the outside AC unit will not turn on. I just have air blowing in the house without AC. I figured out the thermostat went blank when I opened the door on furnace unit to check filter. Sorry I didn't tell you that.
HVAC Technician: Regan Land, HVAC Technician replied 5 months ago

That's okay! I'm glad that issue is solved. In that case, the start kit may be the issue, but there are several other possible causes. Does the outdoor unit stop buzzing when the thermostat is turned off?

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HVAC Technician: Regan Land, HVAC Technician replied 5 months ago

Okay, have you opened the panel on the outdoor unit to see the electrical components? I'm hoping you just have something stuck in the contactor causing it to not be able to make a good contact. Can you take a pic of the electrical section and post it here? Do you happen to have a multimeter handy?

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Customer reply replied 5 months ago
I will open the panel now and take a picture. No I don't have a multimeter handy.
HVAC Technician: Regan Land, HVAC Technician replied 5 months ago

Okay, no worries - Do me a favor and shut the high voltage power off to the outdoor unit. There should be a breaker or disconnect on the wall by the outdoor unit to do this. See if the buzzing stops when you torn the high voltage off.

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Customer reply replied 5 months ago
i shut that off and no buzzing.
Customer reply replied 5 months ago
Occasionally the unit "clicks" even with the power shut off.
Customer reply replied 5 months ago
I actually just have the 30A fuses pulled to shut off high voltage. That works correct?
HVAC Technician: Regan Land, HVAC Technician replied 5 months ago

Okay, I now think the buzzing is coming from the fan motor. That silver cylinder with the wires coming off the top is a dual run capacitor. The top of it (where the wires connect) should be flat - yours is slightly rounded indicating a bad capacitor. That one is a 45+5 x 440. You can find them all over the internet, or you can go to a local HVAC shop tomorrow to purchase one. Just make sure the power is off and that you put the wires back on the new one just like they come off the old one (terminals will be marked C, H, and F). Also, stay away from China made caps - the oil they use in them is not good. Stick with ones made in the USA.

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Customer reply replied 5 months ago
Perfect. Thank you very much.
HVAC Technician: Regan Land, HVAC Technician replied 5 months ago

No problem! If you are satisfied can you do me a favor and rate my services? Thank you for using JA!

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Customer reply replied 5 months ago
If this doesn't start up
The unit tomorrow can I contact you again through this thread?
Customer reply replied 5 months ago
I will be happy to rate your services! It's been great service.
HVAC Technician: Regan Land, HVAC Technician replied 5 months ago

If for some reason this thread closes then you can start another and request me - I'll make sure you won't be charged for the additional question.

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Customer reply replied 5 months ago
Thank you!!
HVAC Technician: Regan Land, HVAC Technician replied 5 months ago

No problem! Let me know if you need anything.

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Regan Land
Regan Land
Regan Land, HVAC Technician
Category: HVAC
Satisfied Customers: 707
707 Satisfied Customers
Experience: Over 20 years of experience, NATE Certified, Licensed HVAC Contractor, Certified IAQ Specialist

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