I disconnected heating element, having it tested along with the thermostat. They tested fine. I need to reconnect it - there are 3 wires & 4 connection points. Which point do I NOT use. HELP!! I don’t want to ruin the thermostat because of an incorrect connection.
Can you post a picture of the thermostat?
Here is a wiring diagram which may help
http://www.servicematters.com/docs/wiring/Wiring%20Sheet%20-%203406688.pdf
Also you did not say which thermostat, there are a number of them in the unit.
Does not make sense that you have 4 connection points and only 3 wires, perhaps a wire has moved so you do not see it.
Always make a diagram or take a photo when removing a number of wires at the same time!!!
Do not apply power to this unit unless you are 100% sure that you have it wired correctly.
Blowing the thermostat is the least of your worries.
You could burn up the wiring and in the worst case scenario cause a fire.
If not 100% sure get a pro in to reconnect your parts!!!