26
Troubleshooting Guide
Symptom Problem Action
Unit shows an empty
battery symbol and
displays reading of
Lb. Alarm chirp
every 30 seconds
Batteries are low
and need
replacing.
See page 11.
Low Battery Warning.
See pages 16-17.
Battery Installation/
Replacement.
Unit shows an empty
battery symbol and
displays reading of
Err. Alarm chirp
every 30 seconds
Battery failure has
been
detected.
See page 11. Battery
Error Warning.
See pages 16-17.
Battery Installation/
Replacement.
Unit shows the
replace sensor icon
and displays a
reading of Err
(battery symbol may
show any state of
charge).
Alarm chirp
every 30 seconds
Sensor failure has
been
detected.
Sensor Malfunction.
No display, constant
alarm and red light.
Microprocessor
failure.
Unit has
malfunctioned.
Unit display shows
Err with battery at
any state of charge
other than empty.
Alarm chirp
every 30 seconds
Unidentified Remove batteries and
reinstall. If Err
continues, unit has
malfunctioned.
See pages 30-31 for
warranty information.
Move the CO alarm and place in another location prior to
performing any of the following:
• Staining or stripping wood floors or furniture
• Painting
• Wall papering
• Using adhesives
Storing the unit in a plastic bag during the above projects will
protect the sensor from permanent damage.
WARNING: As soon as possible, place the CO alarm back in
its proper location to assure continuous protection from
Carbon Monoxide poisoning.
When household cleaning supplies or similar contaminants are
used, the area should be well ventilated.
The following substances can affect the sensor and may
cause false readings:
Methane, propane, iso-butane, iso-propanol, ethylene, benzene,
toluene, ethyl acetate, hydrogen sulfide, sulphur dioxides,
alcohol based products, paints, thinners, solvents,
adhesives, hairsprays, aftershaves, perfumes, and some cleaning
agents.
25
Caring for your Nighthawk
Battery Powered CO Alarm (cont.)
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