Why would the keypad display "Dirty Chamber" on the keypad for the DS7400Series panel?
A multiplex smoke detector has failed its internal sensitivity test.
a) The smoke may not be calibrated.
b) May have a duplicated address
Part numbers DS7400XIVER3+, DS7400XIVER4, MX250, MX250TH, MXB2W, MX280. D7050-B6, D7050, D7050TH