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

Page 49

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

Image 49
Contents Contents Technical Changes Indoor Unit Part Names and FunctionsOutdoor Unit MSH-07NV E1 MSH-09NV E1 MSH-12NV E1 MSH-18NV E1 MSH-18NV E2 Remote ControllerMSH-09NV MSH-07NV E1 MSH-12NV E1 MSH-07NV E2 MSH-12NV E2 MSH-24NV E2MSH-24NV MSH-09NVRH-135VGHT RH-174VGHT SpecificationRC4V19-AA WHT-BLK292 BLK-RED324RC4V19-AA RA4V27-EA RH-231VHAT NH-36VMDTRA4V27-EC NH-47VMDTRA6V85-AA Connected with MXZ-32NV- E1 as multi system units AreWHT-BLK292 BLK-RED324 WHT-BLK292 BLK-RED324 WHT-BLK292 BLK-RED324 WHT-BLK184 BLK-RED251 RA4V19-AA RA4V27-EADB27C / WB19C Outdoor DB35C / WB24C Outlines and Dimensions MSH-12NV E2 MUH-12NV E1 MUH-12NV E2 MSH-18NV E3 MSH-24NV E1 MSH-18NV E2 MSH-24NV E2MUH-18NV E1 MUH-18NV E2 MUH-18NV E3Unit mm inch MUH-24NV- E1 MUH-24NV- E2MUH-07NV Models Wiring Diagram MUH-09NV Outdoor Unit Wiring DiagramF12 FUSE93 Model Wiring DiagramDsar Surge Absorber MUH-18NV E1IC141 Hybrid IC Vane MotorMUH-24NV E1 MSH-24NV E1Contactor Vane Motor MSH-09NV E2 MSH-12NV E2Reversing Valve Coil Relay FAN Motor CapacitorMUH-12NV E2 MUH-18NV E2 Model Wiring Diagram Hybrid IC MUH-24NV E2Surge Absorber TB,TB2 Terminal Block FUSE2A FAN Motor RelayIndoor Unit to Outdoor MSH-07NV Indoor Unit Refrigerant System DiagramMUH-07NV E1 MUH-07NV E2 MUH-09NV E1 MSH-09NV E2MUH-18NV E1 MUH-18NV E2 MUH-18NV E3 MSH-18NV E1 MSH-18NV E2 MSH-18NV E3Outdoor Unit Indoor Unit MSH-24NV E1 MUH-24NV E1 MSH-24NV E2 MUH-24NV E2MAX. Height Difference MAX. Refrigerant Piping LengthAdditional Refrigerant CHARGER-22 g MSH-07NV MSH-09NV MSH-12NV 150When vacuuming Evacuation Proceduresair PurgeAIR Flow Guaranteed VoltageMain Readings Indoor Unit Outdoor UnitCool operation Outdoor LOW Pressure and Outdoor Unit CurrentMUH-07NV E1 E2 MUH-12NV E1 E2 MUH-09NV E1 E2MUH-18NV E1 E2 E3 MUH-24NV E1 E2Heat operation Indoor Unit Display Section Microprocessor ControlFeel Control Minus Heat mode Or less Or less Initial room temperature Minus DRY mode 23 orFuzzy control DRY mode of I Feel Control Cool mode of I Feel ControlWhen the room temperature is 23C or over When the room temperature is under 23COperation time chart Example Heat mode of I Feel ControlIndoor fan speed control High pressure protection RT12 temperatureDefrostings X62 Reversing valve coil 15 sec DRY Operation Cool OperationHeat FAN Motor Control Auto Vane OperationSleep Mode Cancel How to set the timerEMERGENCY-TEST Operation MSH-07NV E1 MSH-18NV E2 MSH-09NV E1 MSH-12NV E1 MSH-18NV E1 Service FunctionsTable.1 No unit Cut J1 2The reset button can be located on the front sideNo unit Cut J2 No unit Cut both J1 and J2MSH-07/09/12 MSH-18/24 MSH-07NV E2 MSH-12NV E2 MSH-18NV E3 MSH-09NV E2 MSH-24NV E2Operation Troubleshooting Operation Indicator Instruction of troubleshootingPage MSH-12NV- E2 MSH-12NV- E1MSH-18NV- E3 Trouble criterion of main partsInodoor fan does not operate Check of indoor fan motorCheck of indoor electronic control P.C. board MSH-07NV MSH-09NV MSH-12NV MSH-24NV MSH-18NV E1 Indoor electric control P.C.board Test Point Diagram and VoltageDeicer P.C. Board MUH-18NV E1 Outdoor deicer P.C. boardPower supply input MSH-24NV E1 MSH-18NV E2 MSH-24NV E2 MSH-18NV E3 MUH-07NV MUH-12NV MUH-18NV MUH-07NV E1 MUH-09NV E1 MUH-24NV E1Operating Procedure Photos Disassembly InstructionsMSH-07NV E1 MSH-07NV E2 MSH-09NV E1 MSH-09NV E2 MSH-12NV E1 MSH-12NV E2Removing the electrical box Photo Operating ProcedureRemoving the vane motor Photo Removing the line flow fan and the indoor fan motor PhotoMSH-24NV MSH-18NV MSH-18NV E1 MSH-18NV E3Removing the electronic control P.C. board Photo Remove the front panel. Refer toRemoving the indoor fan motor and the line flow fan MUH-07NV MUH-09NV MUH-07NV E1 MUH-09NVRemoving the cabinet Photo Remove the deicer P.C. boardRemoving the compressor Photo Removing the outdoor fan motorMUH-12NV MUH-18NV MUH-12NV E1 MUH-18NV MUH-18NV E3Removing the deicer P.C. board Photo Remove the cabinet. Refer to Removing the outdoor fan motor PhotoRemoving the electrical parts Outdoor Unit Operating Procedure PhotosRemoving the fan motor Photo Removing the heat exchanger and the compressor Indoor Unit Heat EXCHANGER1 Parts ListIndoor Unit Electrical Parts Cabinet Service PanelTOP Panel FAN GuardMUH-07/09NV- E1 MUH-09NV E1 MUH-07NV E2 MUH-09NV E2Propeller FAN Deicer P.C. BoardOutdoor Unit Structural Parts MUH-12NV E1 MUH-12NV E2 MSH-18NV E2 WH MSH-24NV E2 WH MSH-18NV E3 WH Indoor Unit Structural Parts MSH-18NV E1 WH MSH-24NV E1 WHIndoor Unit Heat Exchanger Parts 1714 147 Outdoor Unit Structural Parts MUH-18NV E1 MUH-18NV E2Outdoor Unit Structural PARTS17 Remote Controller Accessory and Remote Controller PartsRemote Controller Holder Outdoor Unit Structural PartsOptional Parts AIR Cleaning FilterRefrigerant Pipes Deodorizing Filter

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.