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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I just replaced a P374-1700 thermostat and the screen is

Customer Question

I just replaced a P374-1700 thermostat and the screen is blank. Could I have shorted a fuse. Your help is greatly appreciated.
Submitted: 11 months ago.
Category: HVAC
Expert:  Tim H. replied 11 months ago.

Hi, I'm Tim and I'm an HVAC expert here to help answer your question(s). Please provide all the information I ask for since I'm not onsite. At the end of our dialog you will be asked to rate my service, but please wait until then and all your question(s) have been answered satisfactorily. Thanks for your business!

Yes, it's possible you blew a fuse. Have you checked the circuit board on your furnace for a blown 3 amp fuse?

Customer: replied 11 months ago.
No, I haven't. Can the fuse blow due to touching the thermostat wires together incorrectly and if so, would the fuse be located on the furnace itself, or at a breaker box?
Expert:  Tim H. replied 11 months ago.

On the control circuit board on your furnace.

Customer: replied 11 months ago.
I will head for the attic and check. Thanks.
Expert:  Tim H. replied 11 months ago.

Look in the blower compartment on most furnaces.

Customer: replied 11 months ago.
I didn't see any type of fuse, but I did see a round glass inspection port on both Payne furnace units and they both had a blinking red light.
Expert:  Tim H. replied 11 months ago.

Did you take all the panels off, look for a control circuit board?

Expert:  Tim H. replied 11 months ago.

Did you locate the fuse?