Hey there! It sounds like there could be a few potential issues causing your Edwards Signaling GCHFWF-S2VMCH to malfunction. First, check if the device is receiving power properly. Ensure that the wiring is intact and that there are no loose connections. If power is confirmed, then it might be a programming or configuration problem. Double-check the settings in your fire alarm control panel to ensure that the speaker-strobe is configured correctly for both audible and visual alerts. If everything seems to be in order, it’s possible that the device itself is faulty and may need to be replaced. If you’re not comfortable troubleshooting electrical equipment, it’s best to contact a licensed fire alarm technician for assistance.