Originally Posted by fengshvac
Problem: furnace is not working, no heat.
Cause: somebody installed this thermostat and didn't take out the white plastic piece in the middle of the thermostat, so when you turn the heat on, it didn't close the contact and call for heat.
Solution: take the white plastic piece out and call for heat, heat turns on.
So, you're saying this works on all types of furnaces? There's more than one white plastic piece. Should I take them all out?