![background image](http://html1.mh-extra.com/html/thermofisher-scientific/cryomed-tscm17ea/cryomed-tscm17ea_operating-and-maintenance-instructions-manual_1105580078.webp)
72 | Connectivity Troubleshooting
Controlled Rate Freezer
Connectivity Troubleshooting
This section is a guide to troubleshooting general connectivity problems.
Table 15. Connectivity Troubleshooting Table
Problem
Cause
Solution
Connectivity
Dongle Unplugged
Verify that the WiFi dongle is plugged into a USB port.
Wireless Network (SSID)
is not appearing in
configuration
Invalid network name
Verify that the correct network name is provided.
Network (SSID) is not
visible (Not being
broadcasted)
Verify that the network (SSID) is visible (being broadcasted) using a
mobile device.
*Thermo Fisher Devices are not able to connect to SSID’s that are
not being broadcasted.
Network is not
compatible with
802.11 WiFi dongle
Verify with local IT that the network is compatible with 802.11b/g/n.
*Freezers only support 2.4GHz frequencies; 5GHz frequencies are
not supported.
UI firmware
Contact Service.
Freezer will not connect
to a Wireless Network
(SSID)
Invalid SSID and/or
Password
Verify that you are connecting to the correct network (SSID) and are
entering the correct password. (Suggestion: attempt the same
network connection via an alternate device, like a cell phone,
laptop, or tablet.)
Try restarting the freezer and re-attempt to establish the WiFi
connection.
Network (SSID)
requires user
acceptance or input
via a web browser
Verify that the network (SSID) is not dependent on accessing a web
page first.
*Freezers are not compatible with WiFi networks that require a login
via web page, such as many “guest” or “visitor” networks, these
networks will cause the WiFi connection to fail.
Weak Signal Strength
(RSSI)
Verify that the network (SSID) signal strength (RSSI) has a minimum
value of at least -67dBm at the wireless interface of the device.
MAC Address
Filtering
Verify with local IT if MAC address filtering is in place.
If MAC address filtering is in place, work with local IT to get the
device added to an approved list.
*Navigate to Settings -> Connectivity -> WiFi to see the MAC
address.