Upon arrival tech found blower not running with heat call. Found G circuit only had 8 volts with G call. Verified no issue with thermostat, thermostat wire is shorted and needs to be replaced. Also verified no issue with blower operation when jumped out. There are no extra wires available in existing wire to use. Gave estimate to customer on new wire, informed office to have service manager call Monday morning. Also confirm soonest availability for repair. No house call fee per recent maintenance.