I was called to a home to perform a service on a Goodman furnace. The system was operating normally, but there was a problem with the flame sensor. I found that the blower wheel was dirty and needed to be cleaned. I also found that the flame sensor was not working properly. I scheduled a return visit for Monday, June 11, between 11:00 a.m. and 2:00 p.m. to replace the flame sensor.