Overview
Hardwired initiating device — wired PIR, glass break, or contact for direct connection to VISTA zone inputs (IS335, DT8050, FG1625, etc.).
On Honeywell systems, wireless devices are supervised zones on the panel — tamper, low battery, and missing signals appear as trouble conditions that may block arming depending on panel programming.
At a Glance
| Specification | Details |
|---|---|
| Wiring | Direct to panel zone with EOL supervision |
| Power | Powered or passive per device type |
| Use | VISTA wired zones — not 5800 wireless |
What This Device Does Well
Provides reliable supervised status at the panel and Total Connect 2.0 when installed, enrolled, and range-tested correctly.
Before You Service or Replace One
- Sensor SKU — 5800 Series one-way vs SiX two-way encrypted vs hardwired.
- Panel online — resolve panel AC/cell trouble before blaming sensor.
- Range — 5800RP repeater or move 5881EN/6160RF receiver path for distant zones.
- Battery type — use listed cell; replace all batteries in multi-cell devices.
- Tamper — cover fully closed before declaring hardware fault.
Official Sources
- Resideo product page
- CO5120BN Carbon Monoxide Alarm User Manual (English, Spanish)
- CO5120BN CSFM Listing Card
- CO5120BN ETL Listing Card
- CO5120BN Specification Sheet
Use official Resideo install PDFs and install guides for exact wiring, enrollment, and firmware — specifications vary by SKU and region.
FAQs
Why does my zone show trouble?
Most common: low battery, tamper open, out of range, or wrong sensor type for the panel receiver (5800 Series vs SiX wireless).
How do I replace a sensor?
Delete old zone in installer programming, enroll replacement using Learn mode, and test walk test at final location.
Will Total Connect 2.0 show this device?
When the panel has active interactive service, enrolled zones appear in the Total Connect 2.0 app with status matching the panel.
Where is official documentation?
- Resideo product page
- CO5120BN Carbon Monoxide Alarm User Manual (English, Spanish)
- CO5120BN CSFM Listing Card
- CO5120BN ETL Listing Card
- CO5120BN Specification Sheet
Primary reference: Hardwired sensor install guide
How do I test after installation?
Use panel walk test, zone status, and (if monitored) central station test per dealer procedure.
Can I mix 5800 and SiX sensors?
SiX sensors require ProSeries or Lyric; 5800 needs a 5800 receiver transceiver hardware — they do not enroll on the standard 345 MHz receiver alone.
Why does my zone show trouble?
Most common: low battery, tamper open, out of range, or wrong sensor type for the panel receiver (5800 Series vs SiX wireless).
How do I replace a sensor?
Delete old zone in installer programming, enroll replacement using Learn mode, and test walk test at final location.
Will Total Connect 2.0 show this device?
When the panel has active interactive service, enrolled zones appear in the Total Connect 2.0 app with status matching the panel.
Where is official documentation?
- Resideo product page
- CO5120BN Carbon Monoxide Alarm User Manual (English, Spanish)
- CO5120BN CSFM Listing Card
- CO5120BN ETL Listing Card
- CO5120BN Specification Sheet
Primary reference: Hardwired sensor install guide
How do I test after installation?
Use panel walk test, zone status, and (if monitored) central station test per dealer procedure.
Can I mix 5800 and SiX sensors?
SiX sensors require ProSeries or Lyric; 5800 needs a 5800 receiver transceiver hardware — they do not enroll on the standard 345 MHz receiver alone.