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Bill P.
Bill P., HVAC Mechanic
Category: HVAC
Satisfied Customers: 336
Experience:  Oil / Gas / A/C / Hydronics
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My Carrier AC thermostat has blank screen tonight. It was just

Customer Question

My Carrier AC thermostat has blank screen tonight. It was just working and now is blank
Submitted: 3 years ago.
Category: HVAC
Expert:  Bill P. replied 3 years ago.

Bill P. :

Hi there

Customer:

Good evening

Bill P. :

so the thermostat just went dead?

Customer:

yes

Bill P. :

were you adjusting it when it went blank or?

Customer:

no.. the a/c was running then stopped.. when it didn't turn back on I went to adjust the temp and the screen was blank

Bill P. :

does the thermostat have slide buttons for "cool/off/heat" and "fan auto/fan on" ?

Bill P. :

or are they rubber push buttons, actually it would help if you could find the model of the thermostat

Bill P. :

have you had any storms, power surges pass through?

Customer:

Rubber push buttons

Customer:

no storms

Bill P. :

is it a model with batteries in it?

Customer:

checking...

Customer:

electrical

Customer:

checking the breaker

Bill P. :

some thermostats run on their own batteries, but some need power from the furnace to display

Customer:

It is wired into electrical system... just reset breaker with no change

Bill P. :

what type of system of this, normal inside furnace, outside a/c unit?

Customer:

A/c on roof

Bill P. :

is this a comercial unit then?

Customer:

Residential

Customer:

"Carrier"

Bill P. :

where is the air handler unit? somewhere you can access it?

Bill P. :

(the indoor blower)

Customer:

It is on the roof... ducted into house

Bill P. :

ahh ok, sorry im just completely guessing here without a model number for anything

Bill P. :

did you find whether the thermostat has batteries or not?

Customer:

The thermostat is wired into the electrical system.. NO Batteries.. I have all paperwork for thermostat here.. looking for model #

Bill P. :

On this system the thermostat is getting its power from the outside unit. you have already checked the breakers for the unit, is there any switches of cutoff switches/boxes that could be shutoff?

Bill P. :

if power is getting to the unit, then it could be a low voltage transformer burnt out, or the low voltage automotive type fuse on the control board blown

Customer:

No-

Customer:

It has 24VAC

Bill P. :

the thermostat does?

Customer:

yup

Customer:

reading from the instruction manuel

Bill P. :

hmm ok good, i didnt realize you had tested it

Customer:

for Carrier Heating and Cooling Programmable Thermostat

Bill P. :

?

Bill P. :

are you saying is does have power or its supposed to from what the book says?

Customer:

I didn't test it I am just reading from the manual which states " requires 24VAC to be coonected for proper operation

Bill P. :

ahh ok

Customer:

I don't have ability to test - don't know what 24VAC is

Bill P. :

ok, 24vac is the low voltage that the contol side of you system works on

Customer:

so no batteries right?

Bill P. :

Besides checking all switches etc. that you have access to, there isnt alot you can do without getting in there and troubleshooting

Bill P. :

not by the sounds of what you mentioned there

Customer:

Is there a fuse on the unit on the roof that I should check?

Bill P. :

is it easy access for you to get to the roof or no? you could look for a blown fuse but even that would involve taking a panel off etc.

Bill P. :

in your paperwork is there anything about the model of the outside unit?

Customer:

I did not find any

Customer:

I will go up on the roof and look at it

Bill P. :

ok

Bill P. :

try and find there a smaller (usually brown) wire goes in

Bill P. :

1/2 inch or smaller

Customer:

ok

Bill P. :

however it could be in a conduit and you wont be able to see it. We are looking for where the thermostat wires hook up to a control panel

Customer:

ok

Bill P. :

on that panel somwhere (or in its own small holder) should be a auto type fuse

Customer:

OK

Bill P. :

(turn power off of you are going to start poking around taking a panel off..

Customer:

OH good idea

Bill P. :

sorry im talking about 2 different panels, one i mean like a access door, and the other a control board

Bill P. :

you will need to take a door off to get to any wiring likely, then have a look around

Bill P. :

have a look at any wiring you see, for any burnt wires or melted wires

Customer:

Going to take fuse to Lowe's to get new one.. kind of brown through glass window...??

Bill P., HVAC Mechanic
Category: HVAC
Satisfied Customers: 336
Experience: Oil / Gas / A/C / Hydronics
Bill P. and 2 other HVAC Specialists are ready to help you

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Bill P.
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HVAC Technician
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Oil / Gas / A/C / Hydronics