How to Wire a Furnace Thermostat With 2 Wires | Hunker Sep 04, 2018Two-wire thermostats typically have a red and a white wire. These run from the thermostat to the furnace and control the heat in a home. To wire a thermostat of this kind, basic electrical skills, tools and safety techniques are required. Always turn off the power before starting work.Author: Elizabeth Knoll[PDF] 161154 & New Thermostat Operation 2 Specifications 2 161138 Heat Runs Constantly. 1. Possible short in wiring. Check each wire connection to the thermostat to 2. Possible short in thermostat. verify it is neatly looped under the terminals. No 3. Possible short in heat/fan system. extra wire should stick out from under the terminals. Furnace Cycles Too Fast or Too Slow See Step 5, Adjusting the Anticipator.