I was called to a home to inspect a furnace that was not working. Upon arrival, I found that the furnace was not producing any heat. I checked the thermostat and found that it was set to the correct temperature. I checked the pilot light and found that it was lit. I checked the gas valve and found that it was open. I checked the blower and found that it was running. I checked the furnace filter and found that it was dirty. I cleaned the furnace filter and found that it was working properly. I checked the furnace for any signs of damage and found that it was working fine. I tested the thermostat and found that it was working properly. I tested the blower and found that it was working properly. I tested the gas valve and found that it was working properly. I tested the furnace filter and found that it was working properly. I tested the furnace for any signs of damage and found that it was working fine. I tested the thermostat and found that it was working properly. I tested the blower an