A Check of indoor fan motor

Inodoor fan does not operate.

Turn OFF power supply.

 

 

 

 

 

Check connector CN211 visually.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

No

No

 

 

 

 

 

Are lead wires connected?

 

 

Is soldered point nomal?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

Reconnect the lead wires.

 

 

 

 

 

Resolder it.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Disconnect lead wires from connector CN211 on indoor electronic control P.C. board.

Measure resistance between lead wires { No.1 and No.4 and then No.1 and No.2(MSH-18/24) }

No.1 and No.3 and then No.2 and No.3(MSH-07/09/12)

Is resistance 0 (short circuit) or ∞ (open circuit)?

 

 

No

Yes ( 0 or ∞ )

(others)

Repair the indoor fan motor.

Replace the indoor electronic con- trol P.C. board.

B Check of receiver P.C. board

Indoor unit operates by pressing the EMERGENCY OPERATION switch, but does not operate with the remote controller.

Check the model name of remote controller.

Is LCD display on remote con- troller visible?

Yes

Remove batteries and then set them back. Check if the unit operates with remote controller.

No

Replace the batteries.(see page 47.)

(not clear)

Does the unit operate with remote controller?

Yes

OK

No

Turn on a radio to AM and press switch on remote controller.

Is noise heard from radio?

Yes

Are there any fluorescent lights of inverter or rapid-start type within the range of 1m?

No

No

Yes

Replace the remote controller.

●Re-install the unit away from lights.

●Attach a filter on receiving part.

Measure the voltage between

{

receiver P.C. board connector No.2(+)and No.1(MSH-18/24)

}

 

 

indoor electronic control P.C. board connector LD101 No.2 and JPG(MSH-07/09/12)

when remote controller button is pressed.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is the voltage approx. 4V DC?

 

Yes

 

 

 

Replace the indoor electronic control P.C.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

board.

 

 

 

 

No(5V or 0V DC)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace the receiver.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

51

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Image 51
Mitsubishi Electronics MSH-12NV, MSH-07NV, MSH-09NV, MSH-18NV Check of indoor fan motor, Inodoor fan does not operate
Page 50 Page 52

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.
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