Why does my device show ''CH-'' or " ERROR CODE 1"? Hollyland Tech December 10, 2020 11:33 Updated If the Channel info on the Transmitter display screen is always CH- after running for 2 minutes, then please kindly contact your reseller. This is the error with the hardware, which is unable to be resolved on the user side. Related articles Did the DC adapter charge for batteries ? Can we use mushroom antenna on the MARS 400S ? How to change the video input and output format? APP Error: “check the input source” How to connect a mobile device to the HollyView App ? Comments 0 comments Article is closed for comments.