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Replacement to Firex i240c


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  • 6 months later...


I have 2 hard wired Firex i240c smoke alarms fitted. One in the hallway & one on the landing. 

They both recently started chirping & despite changing the batteries they continued, even when dismounted from the baseplate/electrics. We have found a sticker inside with a 'replace by 2016' notice on them. 

Can I get just the working unit, or do I need to have completely new hard wired units including the ceiling baseplates & do they need replacing by a qualified electrician?

Kind regards,


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  • 4 years later...

the KF20 will fit the base of the i240c perfectly.  THe information in other web chats is incorrect on this......and also the information on amazon. I just purchased the KF20 and when i came to fit it i was preparing for some rewiring but thought i would just check to see if it fit into the i240c base plate and into the i240c connector.  It does. i have tested the alarms and they work perfectly

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  • 2 months later...

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