Found thermostat set to heat set to cool. The indoor unit came on. Tried to get to a/h in attic no platform and could not fit through rafters to get to air handler but found 30 amp bus fuse blown on compressor replaced. The compressor starting amps are much greater than fuses limits but the amps comes down to around 8 amps which fuse can handle. So either you invest in some 30 a,p bus fuses and a fuse puller or invest in new units. condenser is on and running and cooling.