Apologies if this has been asked before. 

I have a network of six EAP115-walls connected to a PoE switch which in turn goes to my router. 5 of the EAPs are set up with one SSID and function as a mesh throughout the house. The remaining one is set with a different SSID and password and will be used for guest access. 

The system worked when I first installed it three weeks ago, but now the guest EAP isn't working. I've reset it with the button on the device, but nothing can connect to the default network, wirelessly or even using the cable. I checked the router and only the first 5 EAPs are showing in the device list, not this last one. I've restarted everything, I've tried different ports on the switch, and nothing seems to be helping. I looked at the FAQs but I couldn't find anything to help, so if you can help at all I'd be very grateful!