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BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22347
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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My thermostat is blank and I can't get it to do anything.

Customer Question

hi, my thermostat is blank and I can't get it to do anything. what do I do
JA: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?
Customer: I think just the thermostat
JA: Do you plan on doing the work yourself?
Customer: if I can
JA: Anything else we should know to help you best?
Customer: no
Submitted: 4 months ago.
Category: HVAC
Expert:  BillyHvac replied 4 months ago.

Hello,

My name is ***** ***** I will do my best to assist you. I am looking over your question now and will respond shortly.

Expert:  BillyHvac replied 4 months ago.

Before we get too far do you mind a test at the thermostat?

It involves removing the top section and locating 2 wires...

Customer: replied 4 months ago.
ok
Customer: replied 4 months ago.
which wires do I look for and then what is the next step
Expert:  BillyHvac replied 4 months ago.

we want to find the green wire and the red wire...Terminals R (may say R,Rh,Rc) and G

Use a paperclip or short wire shaped in a U...hold one wire on R and other on G

Tell me if the blower starts

Customer: replied 4 months ago.
I see red, green and white wires but I don't understand the next step
Expert:  BillyHvac replied 4 months ago.

ok,

do you have a gas furnace and ac, furnace only, boiler, or heat pump and I will clarify

Customer: replied 4 months ago.
Not sure, new house built in 2013. Unit sits outside the house
Expert:  BillyHvac replied 4 months ago.

ok, do you have registers that blow air out or radiators on the walls

Expert:  BillyHvac replied 4 months ago.

and is there an air filter you change?

Customer: replied 4 months ago.
Air blows out registers and I change filters in the attic
Expert:  BillyHvac replied 4 months ago.

ok,

so lets change how we do it.....remove the red wire and green wire,,,and twist together..

tell me if blower starts

Customer: replied 4 months ago.
Nothing happened
Expert:  BillyHvac replied 4 months ago.

ok this means it is not the thermostat.

This means it will involve getting to the unit for further testing.

How do you feel about this?

Customer: replied 4 months ago.
Any chance I could fix the problem or should I call for service?
Expert:  BillyHvac replied 4 months ago.

Its hard to tell. This means the furnace is not sending thermostat power to the thermostat.

Could be:

No power to furnace

bad transformer

blown fuse on circuit board

safety tripped

I am really sorry but it is hard to answer without phyically going to the unit and testing for power.

If you do not have a volt meter and comfort level to test electricity I would call for service.

Billy

Customer: replied 4 months ago.
Ok, thank you. I checked the electrical box in the garage and nothing tripped there so I will call for service. Thanks for your help.
Expert:  BillyHvac replied 4 months ago.

You are very welcome and I really wish you the best.

If you have any other questions let me know as you have 30 day follow up after you rate service today.

Billy