What causes no power to furnace?
What causes no power to furnace? People sometimes turn off these switches accidentally. If the switch is on and the furnace still lacks power, check the furnace's main and secondary electrical panels. If the furnace is not on a dedicated circuit, another appliance might have caused the power surge that tripped the furnace's breaker. How do you test if C wire has power? It is easy to see if you already have a c-wire connected to your system. Simply remove your current thermostat face from its baseplate and look for the terminal labeled with the letter βc.β If this terminal...