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Model # P2740300 totaline thermostat has a blank screen. It's not getting power?

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R Subramaniyam Iyer

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Normally all thermostat functioning with 24 volt. Check power in your thermostat. If not 24 volts, the transformer input where it should be 110/220 volts be there. If yes, your transformer winding open,. Replace transformer. If not,check power.

Posted on Dec 28, 2010

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Does the cover of the thermostat just pop off? It's a totaline o441


Here is the link to Totaline thermostat info page.
I don't see that model number are you sure you have the correct number?

https://www.totaline.com/homeowners/product-instruction-manuals

Sep 23, 2018 | Heating & Cooling

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Thermostat Totaline P7470100


It's probably the liquid crystal has a crack and is flowing inside the glass. It can only be repaired with a new display.

Why not contact Totaline directly and see what they can offer?



Contact Us Totaline

Jul 21, 2016 | Heating & Cooling

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Totaline Thermostate P274-1100 works fine when following programming but when I adjust the temperature manually it will start the furnace and after a few minutes the screen displays E2 error, blanks out,...


E2 is the error code for low line voltage. I would think that this is a erroneous code witch would indicate that the thermostat is defective. do you know if this is true line voltage 120v or transformer voltage 24v?

Mar 05, 2014 | Carrier Totaline P291-1003 Capacitor 10mfd...

1 Answer

I have no idea how to use my totaline digital thermostat,


Totaline is a brand name of the Carrier Corporation. Go on www.totaline.com and research the model of your thermostat. User manuals are available.

Nov 11, 2013 | Heating & Cooling

1 Answer

Totaline power


I don't know anything about your particular T-stat, but power comes from the transformer and there should be a 3 amp fuse next to the transformer. They're both located in the air handler (where the fan and evaporator coil Is).

Oct 06, 2013 | Heating & Cooling

1 Answer

Totaline p374-300 is blank


Have you cleared the float switch?

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

Aug 03, 2017 | Heating & Cooling

1 Answer

I walked across my carpet to reset the temperature on my Totaline P/N P474-1050 thermostat. When I touched the thermosat, there was an arc of electricity. The screen went blank and does not respond to any...


There are two options for this. You can try turing all the power off the the unit completely. The inside and outside unit and give it 30 seconds and turn it back on. This may reset it. Chances are you just burned it up. I hate this for you...
Hope it helps.

Jan 28, 2011 | Heating & Cooling

1 Answer

I have a totaline with issues


Replace the batteries first. If that does not fix it, you either have lost 24V from the furnace/airhandler, or the thermostat is bad.


You may get lucky and find that the only problem is a blown 3 or 5 amp fuse on the board. Although that usually indicates a short somewhere in the system.

Jan 30, 2010 | Heating & Cooling

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