Checked thermostat the thermostat was displaying code CFG008.01 This code means that the configuration for the indoor stage of heat was incorrect restored factory settings and went into install set up to configure the furnace to a two-stage gas furnace and two stage outdoor unit cooling only. The thermostat was set to a modulating furnace, but this furnace is not a modulating furnace, cycled cooling and heating on system is now operating properly.