New Thermo won't work.

[tbone1234]

I have a Totaline thermostat that causes the fan to run constantly. Heat and air both work, but fan stays on. I believe it's the thermo because I can unhook the green fan wire and the fan stops. I just installed a new Honeywell Thermostat and couldn't get it to work. No heat, air or fan. So I reinstalled my old thermostat and it will not work now. No heat, air or fan. I've checked all the breakers (the main and outside)and now not sure what else to do.

[paul52446m]

I have a Totaline thermostat that causes the fan to run constantly. Heat and air both work, but fan stays on. I believe it's the thermo because I can unhook the green fan wire and the fan stops. I just installed a new Honeywell Thermostat and couldn't get it to work. No heat, air or fan. So I reinstalled my old thermostat and it will not work now. No heat, air or fan. I've checked all the breakers (the main and outside)and now not sure what else to do.

When you was working on the stat you might have shorted the low volt wires.
Go to the furnace and find your electronic board. you should see where all your stat wires hook onto the board. On the board kook for a plug in fuse, and check it out. If it is bad you will have to replace it. If the fuse is good, can you check for 24 volt power? If you can't check 24 volt put a jumper wire between the R post and the W post. Have the power switch off when you do this. after you have the jumper on, turn power on and see if furnace fires up on heat? Check back and let me know what you find out. Later Paul

[tbone1234]

It was fuse, thanks for the help.