Halfords Bicycle Computer - Trouble Shooting; No Display; Speed Not Displayed or Wrong Displayed; Irregular Display

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Trouble Shooting
Problem
Check the following:
Solutions
No display
1.Does the battery
have power?
2.Is the battery
installation correct?
1.Replace the battery with a
new one.
2.Make sure the positive pole
of the battery faces the
battery cap.
Speed not
displayed
or wrong
displayed
1.
Is the computer in the
setting mode?
2.Are the magnet and
the sensor in the
correct position? Is
the gap between
both parts correct?
3. Is the wheel
circumference
setting correct?
4. Is the sensing
distance between
the main unit
and the
sensor too long?
5. Is the battery for the
sensor nearly
exhausted?
6. Is there any strong
interference source
nearby?
1. Refer to the setting
procedures to finish the
setting.
2.Refer to the installation
manual and correct the
positions and gap.
3. Refer to "Wheel
Circumference
Measurement and Setting"
and enter a correct value.
4. Refer to the installation
manual and adjust the
distance
between the main unit and
the sensor or adjust the
angle of the sensor.
5. Replace the battery with a
new one.
6. Stay away from the strong
interference source.
Irregular
Display
Refer to "Main Unit Setup"
and initiate the computer
again.
LCD is
black.
Did you expose the
main unit to the direct
sunlight for a long time
when it was not in use?
Put the main unit in the shade
to let it return to normal state.