10-2-1 troubleshooting check table

Before taking measures, make sure that the symptom reappears, for accurate troubleshooting. Self check table

NO.

Abnormal

 

Indication

Symptom

Detect method

Check point

point

 

 

 

 

 

 

 

 

 

0.5-second ON

 

 

 

 

 

 

 

 

 

When serial signal stops for 4

 

 

Mis-wiring

 

 

 

to 5 seconds after 1st on of

 

 

 

 

 

52C relay by POWER turning

 

 

 

 

 

 

 

 

 

0.5-second OFF

 

 

on.

Check wiring (visual check and conductiv-

1

 

 

Outdoor unit

 

ity check).

 

 

 

 

Check indoor electronic control

 

 

 

does not run.

 

 

 

1-time flash

 

 

P.C.board.

 

 

 

 

 

 

 

 

 

 

Check outdoor DEICER P.C. board.

 

 

 

 

 

When serial signal from out-

 

Serial sig-

 

 

 

Check electrical parts.

 

 

 

 

door unit stops for 4 to 5 sec-

 

 

 

 

 

 

nal

 

 

 

 

 

 

 

 

onds.

 

 

 

 

 

 

 

 

 

2.5-second OFF

 

 

 

 

Indoor coil

2-time flash

 

 

 

Check thermistor calibration.

 

thermistor

 

 

 

Detect Indoor coil/room tem-

Reconnect connector.

2

 

 

 

Outdoor unit

perature thermistor short or

Check indoor electronic control P.C.board.

Room

 

 

does not run.

open circuit every 2 seconds

 

 

tempera-

 

 

 

during operation.

 

 

ture ther-

2.5-second OFF

 

 

 

 

mistor

 

 

 

 

 

 

 

 

 

Indoor fan

 

Disconnect connector CN211 and then

 

 

 

 

 

check connector CN121 2 - 3 to make

 

 

3-time flash

 

repeats 12 sec-

When rotational frequency

sure rotational frequency feedback signal

 

 

 

 

onds ON and 3

of 1.5V or over exists.

3

Indoor fan

 

 

minutes OFF.

feedback signal is not emit

Check indoor electronic control P.C.

motor

 

 

When the indoor

during 12-second indoor fan

board.

 

 

 

 

fan breaks, the

operation.

 

 

 

 

Check indoor fan motor.

 

 

2.5-second OFF

fan keeps stop-

 

 

 

 

Reconnect conector.

 

 

 

 

ping.

 

 

 

 

 

 

 

 

 

6-time flash

 

 

 

Shortage of refrigerent.

 

 

 

 

 

 

 

Outdoor

 

 

Outdoor unit

When the outdoor thermistor Check outdoor DEICER P.C. board.

 

 

 

shorts or opens after the com-

 

4 thermistor

 

 

does not run

 

 

 

pressor start-up.

 

 

 

 

 

 

 

 

 

 

2.5-second OFF

 

 

 

 

 

5-time flash

 

 

When the compressor opera-

Check the inverter output.

Outdoor

 

 

 

 

 

Outdoor unit

tion is continuosly three times

Check the compressor.

5 power

 

 

interruped by overcurrent pro-

 

 

 

does not run

 

 

system

 

 

tection within 1 minute after

 

 

 

 

 

 

 

 

 

2.5-second OFF

 

start-up , it stops operation.

 

 

 

 

 

 

 

 

 

7-time flash

 

 

The outdoor unit stops opera-

 

Outdoor

 

 

 

 

 

 

Outdoor unit

tion when it cannot properly

 

6 control

 

 

read data in the nonvolatile

Check the outdoor control P.C.board.

 

 

does not run

 

P.C. board

 

 

memory of the outdoor control

 

 

 

 

 

 

 

 

 

2.5-second OFF

 

P.C.board.

 

 

 

 

 

 

 

Outdoor

10-time flash

 

 

When the indoor unit detects

 

 

 

Outdoor unit

Check the drain punp.

7

control

 

 

drain abnormality and the

Check the drain sensor.

 

 

does not run

indoor coil temperature is too

P.C. board

 

 

 

 

 

 

low.

Check LEV.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.5-second OFF

 

 

 

 

 

 

 

 

When the operation mode of

 

Outdoor

 

 

Outdoor unit

each rooms is setted

Adjust the operation mode.

 

 

COOL(includes DRY) and

8

control

light

2.5-second OFF

runs but the

 

indoor unit does

HEAT at same time, it take

 

 

P.C. board

 

 

flash

 

not run.

precedence the operation

 

 

 

 

 

 

 

 

 

 

mode runs first.

 

The indication is shown only when the indoor unit connects with the outdoor unit MXZ-32NV- E1 .

49

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Mitsubishi Electronics MSH-24NV, MSH-07NV, MSH-12NV, MSH-09NV, MSH-18NV service manual

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.

The MSH series incorporates advanced filtration systems designed to improve indoor air quality. These systems capture dust, pollen, and other allergens, ensuring that the air circulated in residential or commercial spaces remains clean and healthy. Some models feature a dual-layer filter that further enhances dust and odor removal, providing a more comfortable environment for occupants.

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The control mechanisms of the MSH models are user-friendly and versatile. They come equipped with an intuitive remote control, allowing users to easily adjust temperature settings and modes from across the room. Additionally, some models offer smart connectivity features, enabling integration with smart home systems for added convenience and control via mobile devices.

Durability is another key aspect of Mitsubishi's MSH series. They are constructed with high-quality materials designed to withstand various environmental conditions, ensuring longevity and reliable performance. The outdoor units are particularly resilient, featuring weather-resistant components that allow them to operate effectively even in extreme temperatures.

In conclusion, Mitsubishi Electronics' MSH-18NV, MSH-12NV, MSH-24NV, MSH-09NV, and MSH-07NV models represent a blend of energy efficiency, advanced air filtration, user-friendly controls, and durable construction. These units reflect Mitsubishi's commitment to providing high-quality heating and cooling solutions that cater to a wide range of residential and commercial needs while ensuring comfort and convenience for users.