I was called to a home to check on a furnace that wasn't working. Upon arrival, I found that the furnace was working great with no issues found. I tested the thermostat and found that it was working properly. I checked the air filter and found that it was dirty, so I cleaned it and put it back in place. I also checked the venting and found that it was clear and not blocked. I tested the pilot light and found that it was lit and burning properly. I checked the burners and found that they were all working properly. I tested the thermostat and found that it was working properly. I tested the air filter and found that it was clean. I tested the venting and found that it was clear and not blocked. I tested the pilot light and found that it was lit and burning properly. I checked the burners and found that they were all working properly. I tested the thermostat and found that it was working properly. I tested the air filter and found that it was clean. I tested the venting and found that it