C Check of indoor electronic control P.C. board

The unit doesn’t operate with the remote controller.

Also, the OPERATION INDICA- TOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch.

Check both “parts side”and “pattern side” of indoor electronic control P.C. board visually.

Replace the fuse.

Yes

No

Is fuse(F11)blown?

Be sure to check both fuse and varistor in any case.

Is varistor(NR11)burnt?

No

1.Pull out power supply cord.

2.Measure resistance between CN201

1on indoor electronic control P.C. board and N on the terminal block with a tester.

07/09NV CN201

Trouble of indoor electronic con- trol P.C. board.

Yes

Is there resistance ? (Approx.0Ω )

No

Trouble of fuse(F12)

Yes

Replace the varistor.

31

12/18NV CN201

1

2

F12

L

N Terminal

block

D Check of outdoor unit

24NV CN201

3 3

1

F12

2

NF

F12

L

NTerminal block

L

Compressor and outdoor fan do not operate.(Only indoor fan operates.)

Start

NTerminal

block

Press EMERGENCY OPERATION switch. 3-minute time delay works.

Test run operation operates for 30 minutes.

Check voltage to terminal block of outdoor unit. Is there AC220-240V to terminal block between 2 - N ?

No

Check voltage to terminal block of indoor unit. Is there AC220-240V to terminal block between 2 - N ?

Yes

Yes

24NV

Is voltage applied to fan motor and compressor

No

 

relay normal when you look at checkpoints about outdoor DEICER P.C.borad?

Yes

07/09/12/18NV

Check the outdoor DEICER P.C.board at first, then check the outdoor fan motor and the compressor.

Replace

DEICER

P.C.board

07/09/12/18NV

No

24NV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace the indoor elec-

 

 

 

Confirm wiring connection

tronic control P.C. board.

 

 

 

at indoor terminal block.

 

 

 

 

 

 

 

Check the continuity of indoor and outdoor unit connection.

52

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Mitsubishi Electronics MSH-09NV, MSH-07NV, MSH-12NV, MSH-18NV, MSH-24NV Check of indoor electronic control P.C. board

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.

In terms of design, the MSH series is sleek and modern, allowing seamless integration into various interiors. The compact size of these units means they can fit into tighter spaces without compromising performance or aesthetics. Moreover, the whisper-quiet operation is another appealing feature, as it ensures minimal noise disruption during cooling or heating periods.

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.