10-2 Instruction of troubleshooting

Start

Indoor unit oper-

Indoor unit

OPERATION INDICATOR

Indoor unit doesn’t

ates. Outdoor unit

dosen’t receive

lamp on the indoor unit is

receive the signal from

doesn’t operate.

the signal from

flashing on and off.

remote controller.

 

 

remote

 

 

 

 

Also, OPERATION INDI-

 

 

controller.

 

 

 

 

CATOR lamp doesn’t

 

 

 

 

 

 

 

flash, when the EMER-

 

 

 

 

2-time flash

GENCY OPERATION

 

 

 

 

switch is pressed.

Outdoor unit

Outdoor unit

Refer to B

 

 

 

 

 

 

 

 

 

operates in

doesn’t oper-

”Check of

 

 

2.5-second OFF

 

only Test

ate even in

receiver P.C.

 

 

 

 

 

 

 

 

Run opera-

Test Run

board” on page

 

3-time flash

 

tion.

operation.

51.

 

Refer to C “Check of

 

 

 

 

 

 

 

 

 

 

 

indoor electronic control

 

 

1-time flash

 

 

2.5-second OFF

P.C. board” on page 52.

 

 

 

 

 

 

 

Check room

Refer to D

 

 

 

 

 

 

“Check of

 

 

 

 

 

 

temperature

 

 

 

 

 

 

outdoor unit”

 

 

 

 

 

6-time flash

thermistor.

Cause:indoor/outdoor unit

Cause:Indoor unit

on page 52.

 

connecting

 

 

 

 

 

2-time-Room tempera-

2.5-second OFF

 

 

Trouble of mis-wiring

 

 

 

 

 

ture/Indoor coil

 

 

(Trouble of the serial signal

 

 

 

 

 

thermistor trouble

 

 

 

 

 

 

 

 

 

 

 

3-time-Indoor fan motor

Cause:outdoor unit

 

 

 

 

 

trouble

6-time-Replace the out-

 

Refer to E

 

 

 

 

 

door thermistor

 

 

 

 

 

 

 

 

“How to check

 

 

 

 

 

 

 

mis-wiring and sig-

 

 

 

 

 

 

 

nal error

 

 

 

 

 

Check room temperature

 

(when outdoor unit

 

Check indoor coil

Refer to A

 

doesn’t work)”

 

thermistor. Refer to“Test

 

 

“Check of indoor

 

 

thermistor. Refer

 

 

on page 53 and

 

 

point diagram and volt-

 

 

 

fan motor” on

 

54.1

 

to“Test point dia-

 

age” on page 55,57 and

 

 

 

page 51.

 

 

gram and voltage”

58.

 

 

 

 

 

 

 

 

 

 

on page 55,57 and

 

 

 

 

 

58.

 

 

 

 

 

 

 

1<The case of the trouble of the serial signal>

 

 

 

 

When turn off the power and then turn on the power again, the

 

 

 

 

indication shows “the trouble of mis-wiring.”

48

Page 48
Image 48
Mitsubishi Electronics MSH-18NV, MSH-07NV, MSH-12NV, MSH-09NV, MSH-24NV Instruction of troubleshooting, Operation Indicator

MSH-07NV, MSH-09NV, MSH-24NV, MSH-12NV, MSH-18NV specifications

Mitsubishi Electronics has long been recognized for its innovative heating and cooling solutions, particularly in the HVAC industry. Among its notable offerings are the MSH-18NV, MSH-12NV, MSH-24NV, MSH-09NV, and MSH-07NV models, which showcase advanced features and technologies to enhance indoor climate comfort.

One of the standout characteristics of these models is their energy efficiency. Each unit is equipped with an inverter technology that optimizes power consumption by adjusting the compressor's speed according to the cooling or heating requirement. This not only leads to considerable energy savings but also reduces operational costs for users. The units have received high seasonal energy efficiency ratings, making them an environmentally friendly choice.

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