What should I do if my thermostat has 120/240V wires or thick black wires with wire nuts?
If you have thick black wires with wire nuts or your thermostat is 120V or higher, you have a line voltage system and the RTH5160 thermostat will not work. You should not proceed with installation in this case.
Have a follow-up question?
AI-powered answers from the official manual. Verify critical info.
Common questions