Mitsubishi Electronics MSZ-FD09NA service manual How to check miswiring and serial signal error

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D How to check miswiring and serial signal error

Turn OFF the power supply.

 

 

 

 

 

 

 

 

Is there rated voltage in the

 

 

 

 

 

Check the power supply.

power supply?

No

 

 

 

Yes

Turn ON the power supply.

Is there rated voltage between outdoor terminal block S1 and

S2?No

Yes

Press EMERGENCY OPERATION switch once.

Does AREA-L lamp light up? <Confirmation of the power to the indoor unit>

Yes

Is serial signal error indicated 6 minutes later?

Yes

Check the wiring.

No

Is there any miswiring, poor contact, or wire

No disconnection of the Yes Correct them. indoor/outdoor connect-

ing wire?

No

A

Turn OFF the power supply.

Check once more if the indoor/outdoor B connecting wire is not miswiring.

Short-circuit outdoor terminal block S2 and S3. 1

Turn ON the power supply.

1. Miswiring may damage indoor electronic control P.C. board during the operation.

Be sure to confirm the wiring is correct before the opera- tion starts.

3. Be sure to check this within 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. Even when the inverter P.C. board or the outdoor electronic control P.C. board is normal, LED blinks 6 times after 3 minutes.

(Except for outdoor unit of multi system type)

A

• Turn OFF inverter-controlled lighting

equipment.

• Turn OFF the power supply and then

turn ON again.

• Press EMERGENCY OPERATION

Does the LED on the inverter P.C. board or the outdoor electronic control P.C. board repeat "3.6-second-OFF and 0.8-second- ON quick blinking"? 3

Yes

Turn OFF the power supply.

Remove the short-circuit between out- door terminal block S2 and S3.

Turn ON the power supply.

Is there amplitude of 10 to 20 VDC between outdoor terminal block S2 and S3? <Confirmation of serial signal>

Yes

 

 

 

 

 

Replace the inverter P.C. board or the

 

 

 

 

 

 

outdoor electronic control P.C. board.

 

 

No

 

 

 

 

2

 

 

 

 

 

 

(Lighted

 

 

 

 

 

 

 

or not

 

 

2. Be careful to the residual

 

 

 

 

lighted)

 

voltage of smoothing capacitor.

 

 

 

Is there any error of the in-

 

 

 

 

 

 

door/outdoor connecting wire,

 

 

 

 

 

 

 

Replace the indoor/out-

 

 

 

such as the damage of the

 

No

 

wire, intermediate connection,

Yes

 

door connecting wire.

 

 

 

poor contact to the terminal

 

 

 

 

 

 

block?

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

switch.

Is there rated voltage between

Is there any error of the in-

door/outdoor connecting wire,

Is serial signal error indicated 6 minutes later?

Yes

B

No

•Reinstall either the unit or the light each other away.

•Attach a filter on remote control receiv- ing section of the indoor unit.

indoor terminal block S1 and S2?

No

such as the damage of the wire,

 

 

Replace the indoor/out-

Yes

 

door connecting wire.

<Confirmation of power voltage>

 

intermediate connection, poor

 

 

 

 

Yes

 

contact to the terminal block?

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace the indoor electronic control P.C. board.

Be sure to release the failure-mode recall function after checking.

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Contents MSZ-FD09NA MSZ-FD12NA Specification has been corrected New model Accessories Part Names and FunctionsPower supply Phase, Hz 208/230 Weight External finishRemote controller Indoor modelOperating Range Outlet AIR Speed and Coverage RangeOutlines and Dimensions Unit inchAir Air outWiring Diagram Refrigerant flow in cooling Refrigerant flow in heating Refrigerant System DiagramUnitinch Service Functions Timer Short ModeHow to modify the remote controller P.C. board P.C. Board Modification for Individual OperationOperation How to release Auto Restart FunctionAuto Restart Function Microprocessor Control Refer toLamp lights during operation Lamp blinks in abnormal conditionHeat Operation Cool OperationDRY Operation Auto Change Over ··· Auto Mode Operation Mode selectionAuto Vane Operation Outdoor Unit MXZ seriesDirection Feet, set the horizontalVertical vane Area Setting See Control OperationSee Sensor Enlarged view of i-see SensorLighted Not lighted DaytimeNighttime Cold area Operation and operating range Center ·····Program Timer EMERGENCY/TEST Operation Minute Time Delay OperationChanging temperature indication F/C Troubleshooting Before troubleshooting, check the followingLead wiring Housing point Troubleshooting procedure How to replace batteriesFailure Mode Recall Function OFFIndoor unit failure mode table PowerInstruction of Troubleshooting Troubleshooting Check Table Lighted BlinkingArea R Power Trouble Criterion of Main Parts MSZ-FD09NAMSZ-FD12NA Troubleshooting Flow Check of indoor fan motorPage Replace the horizontal vane motor, How to check miswiring and serial signal error Electromagnetic noise enters into TV sets or radios SW P.C. Board Test Point Diagram and VoltageIndoor electronic control P.C. board Power monitor receiver P.C. board Monitor P.C. board Disassembly Instructions Removing the panel PhotoOperating Procedure Photos Open the rear cover of the power monitor receiver P.CRemoving the nozzle assembly Removing the electrical box PhotoPhoto Removing the vertical vane motor unit Correct positionRemoving the horizontal vane motor Photo Removing the indoor fan motor and the line flow fan PhotoMade in Japan

MSZ-FD09NA specifications

The Mitsubishi Electronics MSZ-FD09NA is a wall-mounted split-type air conditioning unit that exemplifies the brand's commitment to efficiency, comfort, and advanced technology. This unit is designed to provide optimal cooling and heating solutions for residential and light commercial spaces, ensuring a comfortable environment year-round.

One of the standout features of the MSZ-FD09NA is its impressive energy efficiency rating. With a high SEER (Seasonal Energy Efficiency Ratio) rating, it utilizes less energy while maintaining high performance, which can lead to significant cost savings on utility bills. This unit adheres to modern energy conservation standards, making it an environmentally friendly choice that appeals to eco-conscious consumers.

The MSZ-FD09NA is equipped with Mitsubishi’s advanced inverter technology, which allows the compressor to adjust its speed according to the desired temperature. This ensures that energy is used efficiently and that fluctuations in temperature are minimized, resulting in enhanced comfort levels. The inverter technology also helps in reducing noise levels, creating a quieter operation compared to traditional HVAC systems.

Another remarkable characteristic of the MSZ-FD09NA is its sleek and modern design, which seamlessly integrates into various interior décors. The unit is available in a clean white finish, making it an unobtrusive addition to any room. Furthermore, it has a compact design that maximizes floor space while providing powerful performance.

The unit also features cutting-edge air filtration systems designed to purify indoor air. With a multi-stage filtration process, including a catechin filter and an anti-allergen enzyme filter, the MSZ-FD09NA effectively captures dust, allergens, and other airborne particles. This feature is particularly beneficial for those with respiratory issues or allergies, contributing to a healthier living environment.

In addition, the MSZ-FD09NA is compatible with smart control options. Users can control their air conditioner remotely through a smartphone app, making it convenient to adjust settings from anywhere. This smart technology allows for programmable scheduling, enabling users to optimize the unit's operation based on their lifestyle.

In summary, the Mitsubishi Electronics MSZ-FD09NA stands out due to its energy efficiency, advanced inverter technology, modern design, high-quality air filtration, and smart control options, making it an excellent choice for those seeking reliable heating and cooling solutions.
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