I have a Goodman heat pump package unit. When I use my air conditioning if I turn the thermostat down two degrees cooler than the current indoor air temperature everything works fine. however, if I turn the thermostat down more than two degrees cooler than the indoor air temperature the compressor and compressor fan come on but the fan in the air handler to move the cool air into the house does not. So the compressor will run continuously if I don't manually intervene (by turning the thermostat to the temperature in the house and waiting for the compressor to turn off-then starting over). Also, if I turn the thermostat down two degrees cooler thatn the current indoor air temperature and wait for the handler fan to come on, I can then turn the thermostat down to any temperature I want and the handler fan will stay on. This problem occured with the old mercury bulb thermostat as well as the new honeywell (Iinstalled the honeywell with phone guidance from my contractor). When I installed the new tstat, I discovered the original tstat low-voltage wire had only 5 wires so I replaced it with a seven wire. If it helps, the connection panel where the tstat wire connects on the heat pump is relatively rusty although the heat pump is only three years old. I cleaned all the connections as best as I could when I wired the new tstat.

Thanks in advance for any help.