beautypg.com

MITSUBISHI ELECTRIC Mitsubishi Split-Type User Manual

Page 13

background image

13

2. Indoor unit failure mode table

NOTE:Blinking patterns of this mode differs from the ones of Troubleshooting check table(9-4.).

12-time flash
2.5-second OFF

Replace the indoor electronic control
P.C. board.

Indoor control system

When it cannot properly read data in the
nonvolatile memory of the indoor electronic
control P.C. board.

11-time flash
2.5-second OFF

Refer to 9-6.

A

"Check of indoor fan

motor".

Indoor fan motor

When the rotational frequency feedback
signal is not emitted during 12-second the
indoor fan operation.

2-time flash
2.5-second OFF

Refer to the characteristic of the main
indoor coil thermistor, the sub indoor coil
thermistor (9-7.).

Indoor coil thermistor

When the indoor coil thermistor short or
open circuit is detected every 8 seconds
during operation.

3-time flash
2.5-second OFF

Refer to 9-6.

D

"How to check miswiring

and serial signal error".

Serial signal error

When the serial signal from the outdoor unit is
not received for a maximum of 6 minutes.

1-time flash
every 0.5-second

Refer to the characteristics of the room
temperature thermistor (9-7.).

Room temperature
thermistor

When the room temperature thermistor
short or open circuit is detected every 8
seconds during operation.

Not lighted

Normal

Left lamp of

OPERATION

INDICATOR lamp

Check point

Abnormal point

(Failure mode)

Detection method

OB378_--1qxp 05.1.17 12:55 Page 13

This manual is related to the following products: