Co2 Controller Problems Help Please !

i have a sentinel cppm-4 i only used it for about a week. it just recently stopped working. the display just reads "high co2". ive tried to run the sensor to a vacant room and still after it restarted, same problem. anyone own one of these or heard of this problem?

I have one. It sounds like you need a new sensor lead. Did you happen to get yours wet?

that sensor is crazy sensitive. I would guess that first

seems that it was having a problem with nearby digital frequencies from other ballast, etc. after moving things around i got it working again. thanks !