Controller Maintenance Process
Curtis AC controller
LED Display Information Description
Two LED indicator
lamps are not on
The controller power is not connected
or the vehicle battery runs out
The yellow LED
flickers
The controller works normally
The yellow and red
LEDs are normally on
The controller is in program load status
The red LED is
normally on
Check whether it is invalid or the software is not
installed with restart key switch; if restart is
required, the software should be reinstalled.
The red and yellow
LEDs flicker
alternatively
If the controller is faulty, reading is required
according to lamp flicker at this time; fault code
value needs to be read.
The fault code consists of two digits.
The permanent order is: Red first and yellow later.
Red lamp flicker indicates digit position.
Yellow lamp flicker indicates specific value of
corresponding digit.
If the red lamp flickers once, it indicates that the
corresponding code digit is the tens place of digit
and if the red lamp flickers twice, it indicates the
ones place of digit.
For example, if the red lamp flickers once and the
yellow lamp flickers three times, it ind
icates that
the value of tens pl
ace of digit is 3.
Then, if the red lamp flickers twice and the yellow
lamp flickers once, it indicates that the value of
ones place of digit is 1.
Therefore, the complete fault code is 31.
The signal lamp can display multiple faults. The
code value can be read successively with this
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