During the wall painting at home, I removed the thermostat wires from the unit, a simple Bryant no programmable one
Once I tried to reinstall it, simply it is dead
I verified the voltages and they don't look correct to me... Please comment about it
4 wires for heart & A/C
RED
GREEN
WHITE
YELLOW
and COMMON
Voltage from any wire to RED shows -11.2v (considering that I put the red test in RED and the other one in any of the others wires
At first, is it not 24v DC the average voltage I should read
Why the voltage appears switched?
Where is my problem? Is there any fuse in the fan (also Bryant)?
Thank you for your help

 

Welcome to the forums.

Your meter needs to be set to AC voltage...... not DC.

Between red and common should be 24VAC.
You should actually measure 24vac between red and any other wire.

You should turn the furnace off when working on the thermostat. If it turns out that you don't have the 24vac.... then you may have a plastic type auto fuse on the control board.

 

Following your instructions, I was able to replace the fuse in the Heater unit and the thermostat worked again.
Thank you very much fro your help.