Hi Jeff, are you referring to EmonESP Wifi adaptor?
There is no default password since authentication should be switched off at standard.
You could try and hold down the BOOT / GPIO0 button for about 10s when powering up the unit. This will force WiFi AP mode which should let you connect directly via WiFi. If this doesn’t work then you will have to manually clear the config. This will require a USB to UART programming cable.
