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My thermostat is blank and the breker is tripped at the

Customer Question
My thermostat is blank...

My thermostat is blank and the breker is tripped at the outside unit. I turned the breaker on and hooked the red and green wire from the thermostat together and the fan came on. When I was installing the green wire back to the thermostat ( red wire was not installed) the screen came back on intermittently. when I made the connection it was still blank. The breaker at the unit was not tripped.

Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?

I do not know.The screen went blank last night and the heat quit working.

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

If I can. MY son is experienced in electrical work and he will help me.

Submitted: 6 months ago.Category: HVAC
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Answered in 5 minutes by:
1/7/2018
HVAC Technician: HVAC Guru, HVAC TECH replied 6 months ago
HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 18,713
Experience: 20yrs in the HVAC industry with certificates and degrees.
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HVAC Technician: HVAC Guru, HVAC TECH replied 6 months ago

Do you have a volt meter and can you test from the R to the C terminal at the thermostat for 24-27 volts AC?

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Customer reply replied 6 months ago
I will have to find meter
HVAC Technician: HVAC Guru, HVAC TECH replied 6 months ago

OK check that and let me know what you find.

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Customer reply replied 6 months ago
I will have to find meter I will take a while if I can find it at all
Customer reply replied 6 months ago
I will have to find meter I will take a while if I can find it at all are you still there
Customer reply replied 6 months ago
Can I get a case number ***** get back to you. We are renovating and my tools are packed up
HVAC Technician: HVAC Guru, HVAC TECH replied 6 months ago

Yes I am online just post when you got it note I am helping other customers and there is a delay in responses just post here bookmark this URL

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Customer reply replied 6 months ago
0 reading
HVAC Technician: HVAC Guru, HVAC TECH replied 6 months ago

What likely happened is the low voltage fuse in the furnace or airhandler blew. There typically is a SLOT STYLE 3-5AMP FUSE on the board itself inside the furnace/airhandler like this.

CLICK HERE

If that is burned out all power to the thermostat will be lost. 95% of all units use some sort of SLOT FUSE or inline BUS STYLE FUSE to protect the low voltage circuit. You need to find that and change it out. If you just bump two wires together you could have just popped it without even knowing it. Now if for some reason your unit does not use a fuse often the board will be damaged due to the short. You would need to confirm you have 24 volts to the board inside the furnace/airhandler with a volt meter to make sure though.

Note if you have a condensate pump check the float and make sure the pump is not full of water...as that could cut low voltage power to the unit as well if the pump is not working and full of water.

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Customer reply replied 6 months ago
Is air handler revering to the outside unit or unit in the attic? Is there a fuse in the outside unit?
Customer reply replied 6 months ago
Is air handler reffering to the outside unit or unit in the attic? Is there a fuse in the outside unit?
HVAC Technician: HVAC Guru, HVAC TECH replied 6 months ago

No no fuse on the outside unit the one in the attic

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Customer reply replied 6 months ago
Thanks. Would that cause the breaker outside to trip? It smells like electrical wires burning when I open the outside panel.
HVAC Technician: HVAC Guru, HVAC TECH replied 6 months ago

It could if something is shorted

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Customer reply replied 6 months ago
Thanks. Would that cause the breaker outside to trip? It smells like electrical wires burning when I open the outside panel.
I have two units outside ( upstairs and downstairs). The upstairs is working. There are two breakers in the panel outside. Only one was tripped
Customer reply replied 6 months ago
I have two units outside ( upstairs and downstairs). The upstairs is working. There are two breakers in the panel outside. Only one was tripped. Is the air handler in the attic only hooked up to one unit or both?
HVAC Technician: HVAC Guru, HVAC TECH replied 6 months ago

It could be hooked to both or one it just depends on how it was wired. This sounds like you may need an electrician or HVAC tech onsite to see what has failed.

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Customer reply replied 6 months ago
If it is hooked to both, then could it still be the pump in the airhandler in the attic. The tray is dry. Do you think the failure is in the unit outside. if the short is in the outside unit, would that have caused the thermostat to go blank when the breaker tripped?
Customer reply replied 6 months ago
If it is hooked to both, then could it still be the pump in the airhandler in the attic. The tray is dry. Do you think the failure is in the unit outside. if the short is in the outside unit, would that have caused the thermostat to go blank when the breaker tripped?
Are you still there?
HVAC Technician: HVAC Guru, HVAC TECH replied 6 months ago

I would check the unit in the attic, but a short from the outside unit goes to the insie unit in the attic as well so it could have blown the fuse on the board in the attic unit. Check the board on the airhandler in the attic

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