Identify whether you selected a live feed
A running channel and a separately chosen on-demand programme are different modes. The 5 help page for live channels describes that specific viewing context. Record the feed and device before applying advice written for another mode or assuming that a cast button should appear whenever the application can play video.
Use the explicit provider statement
The retrieved live-channel article, updated in October 2026, says Chromecast cannot be used for those live feeds and that the icon will not appear. That is more specific than general statements that an application supports a television device. Repeatedly restarting a router cannot establish a function excluded by the relevant feature guidance.
Do not generalise the result to every playback problem
A missing casting control is different from a programme failing to start, a channel being outside its rights window or an unsupported device. The provider publishes separate information for programme rights and supported platforms. Keep these possibilities distinct instead of treating all of them as one casting fault.
Choose a documented viewing route
If live television is the goal, check5’s supported devices and use a legitimate app or website route that provides the needed feed. Confirm the particular screen rather than assuming any external player can replace the service’s controls. For a discrepancy with current help, report the device, app version and exact channel through the provider’s official contact route.
Questions, answered
Should the absence of the icon always trigger network resets?
No. First check the mode. The 5 live-channel help explicitly says Chromecast is unavailable for live feeds.