Blumengarten
Member
When I turned my furnace (we have radiators) on for the winter, the furnace wouldn't turn off .. it was over 90° in here! I asked a handy friend what he thought it would be, he said first to replace the thermostat, if it's not that it's probably a thermocouple, but try the thermostat first. So I bought a new Honeywell CT87K (for heating only, we don't have air conditioning).
There were only two wires connected to the old Honeywell thermostat, a red won connected to a screw in the plate, the blue one connected to a screw on the thermostat. The blue, yellow, green, and white wires were folded back into the hole.
The directions for the new thermostat said to label the wires, but I didn't because there were no letters or any indication of anything on the old thermostat. It says to connect the R wire to the R on the thermostat and W to the W -- there are directions also for a 3-wire hot-water heat-only system, but since the old thermostat only used two wires, I think I should use the two wires. I'm not an electrician, just a mom, but I do know that the colors are just aids, and it doesn't matter which color wire you use just as long as you are consistent at each end, so I shouldn't be concerned that whoever installed the thermostat used a blue wire instead of white. But would you just put the blue wire in the W slot?
There were only two wires connected to the old Honeywell thermostat, a red won connected to a screw in the plate, the blue one connected to a screw on the thermostat. The blue, yellow, green, and white wires were folded back into the hole.
The directions for the new thermostat said to label the wires, but I didn't because there were no letters or any indication of anything on the old thermostat. It says to connect the R wire to the R on the thermostat and W to the W -- there are directions also for a 3-wire hot-water heat-only system, but since the old thermostat only used two wires, I think I should use the two wires. I'm not an electrician, just a mom, but I do know that the colors are just aids, and it doesn't matter which color wire you use just as long as you are consistent at each end, so I shouldn't be concerned that whoever installed the thermostat used a blue wire instead of white. But would you just put the blue wire in the W slot?