- Model Number
- 6-10 years
So... 6 year old unit. Has new rc fan, new control board, new power board ... Thermistors check ok. When running diagnostic service test 4, all goes well until 4.05- " Compressor on- Drive valve to FC and turn FC fan on".... When this test is underway, the unit shuts down and later displays the dreaded "PO" outage message... Please help! I'm at a loss. I'm sure there is a sealed system issue, but would that cause the unit to shutdown when sending the refrigerant flow to the FC? Could this be an FC evap fan issue? Any help would be greatly appreciated!