Fire listener doesn’t work

I recently installed the fire/carbon monoxide listener. The self test detects carbon monoxide but registers nothing for fire.

Any tips?

Hi @astrodonkey. If you have a standard smoke detector, your Smoke and CO Listener should be detecting the beeps it makes. I would ensure that your smoke detector is making a temporal 3 tone, and not another type of sound, as a temporal 3 tone is what the Listener is designed to hear. You can find this information via the smoke detector manufacturer. This Help Center article here has information on your Smoke and CO Listener. I hope this helps.