crwdns2934241:0crwdne2934241:0 Daniel Pouliot

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Do you mean Nuvo Lite? If that’s the unit you are describing the manufacturer is Nidek Medical.  If the unit is signaling red it could mean a failure somewhere in the system.  Here is the link for the resources section. Download the Service manual for your model which is the Nuvo Lite.

https://www.nidekmedical/resources

Good Luck!!

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