Mismatching the Furnace and Thermostat:
Furnaces and thermostats are not mix and match appliances. Using the wrong type of thermostat with a furnace will cause operating problems and can be dangerous. Although thermostats look similar they are designed vary differently.
There are numerous types of heating systems and thermostat systems and they need to be coordinated for safe and proper operation.
Review the tutorial Thermostat and Furnace Compatibility to understand the three types of thermostat systems used today:
