520 Indoor / 520 Outdoor Service Manual
Ver. 1.00
62
CONFIDENTIAL
B. Error code history
The 520 Indoor and 520 Outdoor has an “Error-call
button” on the computer board that provides two main
functions. The button is located next to the dipswitches
(please look at the picture to the right).
B-1. Displaying error code history
1.
Briefly press the “Error-call button” (do not hold down
the button).
2.
If the 520 Indoor or 520 Outdoor has had prior error
codes, the 3-digit 7-seg LED will display the most recent
error code first. Pressing the button again will display
the 2
nd
most recent error code and so on (Computer saves
a maximum of 12 error codes). If the 520 Indoor or 520
Outdoor has never had any error codes, the 3-digit 7-seg
LED will blink a bar “- - -“ as shown the picture to the
right.
B-2. Clearing error code history memory
1.
Press and hold the “Error-call button” for at least
5 seconds.
2.
The 3-digit 7-seg LED will display “CLr” in
succession to signify that the computer board
memory has been erased of all error codes.
“Error-call” button 3-digit 7-seg LED