Obh621 - Mitsubishi Electric MS-GF20VA-E1 Service Manual

2. Indoor unit failure mode table
Upper lamp of OP-
Abnormal point
ERATION INDICA-
(Failure mode)
TOR lamp
Not lighted Normal
1-time fl ash every Room temperature
0.5-second thermistor
Indoor coil
2-time fl ash
2.5-second OFF
thermistor
11-time fl ash
Indoor fan motor
2.5-second OFF
12-time fl ash Indoor control
2.5-second OFF system
14-time fl ash 1 Refrigerant
2.5-second OFF circuit
NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.).
1. A blinking pattern when "14-time flash" is displayed :
2.5-second
OFF
ON
OFF

OBH621

The room temperature thermistor short or
open circuit is detected every 8 seconds dur-
ing operation.
The indoor coil thermistor short or open circuit
is detected every 8 seconds during operation.
The rotational frequency feedback signal is
not emitted for 12 seconds after the indoor fan
motor is operated.
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
Refer to 10-4. No.4 "Condition".
3.0-second 14-time
flash
ON
Beeps
Repeated cycle
Condition
—
2.5-second 3.0-second 14-time
flash
OFF ON
Beeps
Repeated cycle
17
Remedy
—
Refer to the characteristics of the room temperature
thermistor (10-7.).
Refer to the characteristics of the indoor coil thermistor
(10-7.).
"Check of indoor fan motor".
Refer to 10-6.
Replace the indoor electronic control P.C. board.
Refer to 10-4. No.4 "Remedy".