Replacing a Faulty Deta 1121 Carbon Monoxide Alarm with a New Deta 1169
As I sat in my kitchen, enjoying a warm cup of coffee on a chilly morning, my Deta 1121 Carbon Monoxide alarm suddenly let out a loud beep, indicating an end-of-life failure. My initial thought was to simply replace the alarm with a new one of the same model. However, I quickly realized that the Deta 1121 has been discontinued and replaced by the newer Deta 1169 model. This left me with a dilemma – how could I replace my faulty alarm with a more modern and reliable one?
After conducting several internet searches, I discovered that many people have faced the same issue, but there is limited useful information available online. Therefore, I decided to share my experience of replacing my Deta 1121 with a new Deta 1169 Carbon Monoxide alarm, in the hope that it will help others who may be facing similar challenges.
Sourcing the New Alarm
The first step was to find a reseller for the Deta 1169 Carbon Monoxide alarm. Since Deta does not supply directly to consumers, I had to look for a reliable online retailer. After comparing prices and reviews, I found tradesparky.com to be the best option, with a price of £57.00 including postage and packing (link here).
Installation Tips
Before starting the installation, it is essential to turn off the fuse at the fuse box that supplies power to the existing Deta 1121. This will prevent any electrical shock or damage to the new alarm. In my case, the separate labelled fuse made it easy to identify and switch off the power supply. However, if you are unsure, look for the lights to be turned off when the power is disconnected.
Once the old base is removed, simply present the new base to the ceiling and fit it. I used one of the existing screw holes but needed to drill a new one for the other. In order to fit the wiring and mount over the previous base, I had to drill a new hole for the wires as there was no easy knockout on the back. This may or may not affect you, depending on your specific installation.
Interconnection to Smoke Alarms
The new Deta 1169 Carbon Monoxide alarm is only compatible with the 116 smoke alarms. Since my existing smoke alarms are model 115, I had to disconnect them for now and sleeve the wire. As shown in the image, the 115 says it needs to be replaced in March 2026. Therefore, I may well upgrade them to 116 smoke alarms once they start to fail.
Conclusion
Replacing a faulty Deta 1121 Carbon Monoxide alarm with a new Deta 1169 is not a straightforward process, but it can be done with some careful planning and installation. By following the tips outlined above, you should be able to replace your old alarm with a more modern and reliable one. Remember to turn off the power supply before starting the installation, and be comfortable working with electricity.
Useful links:
* <https://www.tradesparky.com/fire-and-security/fire-alarm-and-detection-systems/carbon-monoxide-systems/deta-1169-carbon-monoxide-alarm-230v-whi>
* <https://www.deta.co.uk/news/news-archive/carbon-monoxide-co-alarm>
* <https://www.deta.co.uk/products/safety-alarms/carbon-monoxide-alarm-240v-with-9v-replaceable-battery-back-up-1169>
Thank you for reading, and I hope this blog post has been useful in helping you replace your faulty Deta 1121 Carbon Monoxide alarm with a new Deta 1169. Good luck!