Upon arrival Customer stated the thermostat was not working properly. During evaluation found the system was not coming on while thermostat was calling for cool. Fan motor came on immediately but Condenser never came on. Fan setting on thermostat was set to auto but Fan was constantly blowing and no why call at unit when thermostat said it was calling. Removed thermostat and jumpered R, G and Y. Fan and Condenser came on. Internals of thermostat are not working properly thermostat needs to be replaced