Hi, I have dual heat/ac unit the fan does not come on for heat; however, the a/c works fine. I have replaced the Fan Cycle control and tested the relays which are fine. I gas heat engages just fine and the unit gets got but the fan does not engage. My fan cycle control has a manual switch to engage the fan and when press an internal fans does come on; however, the large fan blades outside do not engage. Also, when bypassing the delay by pressing manual override on one of the relays the large fan does engage. What should I do next - how do I get a service manual for the unit. The model and serial numbers are below. Thanks in advance and Happy New Year, Tom Model# RRGF-05E2-4JKR Serial# WNA-4110-A-HA-A-F1488-3456 Thanks you for the answers so far: 1. When I depress the manual switch on the FCC(fan cycle control) the internal fan turns on. 2. As mentioned the gas comes on and gets plenty of heat. 3. According to Spring Rooster the outside fan is only used with the a/c. Thank you Rooster that is very helpful... 4. I still have no heat inside - please help.