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6.8 Automatic Self-Test
The smoke chamber automatically tests itself every 40 sec-
onds. If the chamber is degraded it will beep without the red
light flashing at the same time. If this happens clean the unit.
If the beeping persists and the beep does not coincide with an
red light flash, return the unit for service (see Getting your
Smoke Alarm Serviced ).
6.9 Dust & Insect Contamination
All Smoke Alarms and particularly the optical (photoelectric)
type are prone to dust and insect ingress which can cause
false alarms.
The latest design, materials and manufacturing techniques
have been used in the construction of our Alarms to minimise
the effects of contamination. However it is impossible to com-
pletely eliminate the effect of dust and insect contamination,
and therefore, to prolong the life of the Smoke Alarm you must
ensure that it is kept clean so that excess dust does not build
up. Any insects or cobwebs in the vicinity of the Smoke Alarm
should be promptly removed.
In certain circumstances even with regular cleaning, contam-
ination can build up in the smoke sensing chamber causing
the alarm to sound. If this happens the alarm must be
returned to us for servicing or replacement. Contamination is
beyond our control, it is totally unpredictable and is consid-
ered normal wear and tear. For this reason, contamination is
not covered by the guarantee and a charge is made for all
servicing work.
If you experience persistent false alarms, in particular loca-
tions, due to contamination of the smoke chamber you could
consider fitting an ionisation type Smoke Alarm. The principle
of ionisation detection makes it less vulnerable to the effects
of dust or insect contamination.
6.10 Replacing the Battery (Model Ei 405 & Ei405C only)
A fresh Alkaline Battery should last for over a year. When the
battery power is low and replacement is necessary, the Alarm
will beep and the red light will flash at the same time about
once per minute for at least 30 days. The battery must then
be replaced. Replace the battery if the alarm does not sound
when the Test Button is pressed. For maximum reliability,
replace the battery at least once a year (see fig 1a for how to
remove unit from the mounting plate).
6.11 End of life
The entire Smoke Alarm must be replaced if:-
(i) The unit is installed for over 10 years (check the replace-
ment year marked on the unit).