I bought a Kidde KN-COSM-IBA to replace a 6 years old Firex i4618A detector that won't quit chirping even after battery replaced. Both the old and new detectors has the same wire quick connector that looks like below.
Since they have compatible connectors, I didn't re-wire the quick connect that comes with the new one.
Once I plug the connector into the new fire detector, the rest of the detectors in my whole house went off and won't stop.
Does anyone know what could be wrong?