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HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 13987
Experience:  15yrs in the HVAC industry with certificates and degrees.
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I went to move my Series FocusPRO® 5000 thermostat and now

Customer Question

I went to move my Series FocusPRO® 5000 thermostat and now it seems to have no power. I took pictures of the wires so not to miss wire but it shows nothing on the screen unless I add batteries. Please help
Submitted: 6 months ago.
Category: HVAC
Expert:  HVAC Guru replied 6 months ago.

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Answer:

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.

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Customer: replied 6 months ago.
I have a split unit. Half in my attic and the other outside. Where would I find this fuse on the unit (s)
Customer: replied 6 months ago.
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Expert:  HVAC Guru replied 6 months ago.

It would be in the attic that is where the airhandler is and the board should be.