Hitachi RAK-15QPC Service Manual page 66

Self-diagnosis display function (indoor side display)
While the "timer lamp" (orange), of the indoor unit is blinking,
troubleshoot the product
while referring to the table below.
1. How to count the lamp blinking frequency
・ The product will repeat blinking with 2-second
intermissions.
・ The blinking speed is as follows: on for 0.35 seconds and
off for 0.35 seconds.
2. If you wish to try another operation while the lamp is blinking, operate the START/STOP button on the remote control unit
twice. The first push will reset the indoor microcomputer, while the second will activate the product
[An example of 5-time blinking]
2-second
intermission
66
2-second
intermission