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Check if you have already chose Backlight On in system
setting. Or a damage has occurred to the backlight chip.
Why is the backlight always lit?
Er0
Internal sensor failure. Check if the sensor is damaged during
installation.
Er1
External sensor failure. Check if the sensor is damaged during
installation.
External sensor not connected under Monitor Method ALL.
What does Er0 / Er1 mean?
Q & A
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