Once a month, open a door on each section and verify that no moisture or debris is accumulating in the unit.
The steps below are necessary only if the unit has been started:
If the unit is equipped with a gas furnace, close the gas shutoff valve and open furnace control switch S3.
After extended storage, perform a complete start up. Inevitable accumulations of dirt, insect nests, etc. can contribute to problems if not cleaned out thoroughly prior to start up. In addition, thermal cycling tends to loosen mechanical and electrical connections. Following the startup procedure helps discover these and other issues that may have developed during the storage interval.
Source: MaintainX (Community Member)