Hitachi RAF-25RXB Service Manual page 93

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
DESCRIPTION OF THE SELF-DIAGNOSIS INDICATION
REFER TO THE TABLE BELOW IF THE TIMER INDICATOR (ORANGE)
IS BLINKING.
LAMP BLINKING MODE
2 sec
2 sec
2 sec
2 sec
2 sec
2 sec
2 sec
2 sec
(
LIGHTS FOR 0.35 SEC AT
INTERVAL OF 0.35 SEC.
＊IF THE INTERFACE CIRCUIT IS DEFECTIVE WHEN THE POWER IS
TURNED ON, THE SELF-DIAGNOSIS INDICATION WILL NOT WORK.
＊IF THE INDOOR UNIT CAN NOT BE OPERATED AT ALL,
REFER TO THE TABLE BELLOW.
CHECK POINT
FU1(3.15A)FUSE BLOWN
COME OFF OR DISCONNECTION OF THE
CONNECTOR FOR LIGHT RECEIVING
UNIT AND SWITCH P.W.B
FAILURE OF CONTROL P.W.B
ONCE
REFRIGERANT CYCLE DEFECTIVE
2 TIMES
FORCED COOLING OPERATION
3 TIMES
INTERFACE DEFECTIVE(INDOOR)
4 TIMES OUTDOOR UNIT DEFECTIVE
INDOOR THERMISTOR DEFECTIVE
9 TIMES
ABNORMAL ROTATING NUMBERS OF
10 TIMES
DC FAN MOTOR
12 TIMES INTERFACE DEFECTIVE(OUTDOOR)
13 TIMES
IC531 DEFECTIVE
)
REPLACE THE PART WHICH CAUSED BLOWING
/DISCONNECTION OF FU1(3.15A)FUSE
FIX CN13 AND CN17 CONNECTOR
REFER TO THE SERVICE GUIDE FOR
HOW TO DETERMINE THE FAILED PART
13ー6
[An example of 5-time blinking]
2-second
intermission
MAIN DEFECTIVE
ACTION/REPLACEMENT PARTS,etc
2-second
intermission