Air Conditioner Frequently Asked Questions

Air Conditioner

Frequently Asked Questions

Air Conditioner

Frequently Asked Questions

General Questions for Residential Air Conditioner (RAC) and Slim Packaged Air Conditioner (SPAC)

Looking for details on Residential Air Conditioners (RAC) and Slim Packaged Air Conditioners (SPAC)? This section covers everything you need to know for both RAC and SPAC units, helping you resolve common issues and optimise performance at home.

Are spare parts easily available?
Absolutely! We have wide range of spare parts available. Do visit our service center at Lot 11, Jalan 51a/219, Seksyen 51a, 46100 Petaling Jaya, Selangor (MESM). Our operating hours are from 8:30 AM to 5:30PM, Monday to Friday. Our friendly staff are here to help you!
What is Plasma-Quad Plus?
The Plasma Quad Plus Filter works like an electrical curtain, using an electrical discharge to catch and neutralise even microscopically small particles in the air. In fact, it can even capture PM2.5 particles (which are up to 20 times smaller than the width of hair!)
How do I choose the right air conditioner unit for my house?
To find the recommended AC unit for your home, use our heat calculator to identify the best fit for your space.
Why is my air conditioner not cold?
Your air conditioner might not be cold due to a dirty air filter, thermostat issues, condenser problems, or a failure in the compressor or other components. Please consult our service team for further diagnosis.
Why my indoor unit leaking water?
Your indoor unit might be due to time for service. For assistance, contact our service at 1300-13-1303.
What is an inverter and non-inverter?
  • Inverter AC: Adjust compressor speed based on cooling demand, consuming less energy and offering quieter operation.
  • Non-Inverter AC: Operates at a fixed speed, switching on and off to regulate temperature. They are less energy-efficient compared to inverters.
What do energy star ratings mean?
Energy star ratings show how energy-efficient an appliance is. The higher the energy rating, the higher energy efficient.
Why is my indoor unit have a foul smell?
A foul smell in your indoor unit may be caused by mold or bacteria due to accumulated moisture. Regularly clean filters and units to prevent this issue. For cleaning maintainance, please contact 1300-13-1303
What's the "Auto-Mode" fuction and its benefit?
The "Auto-Mode" function adjusts the temperature based on the remote's location, ensuring you're comfortable wherever you are in the room.
Why is the indoor unit noisy?
The line flow fan may have accumulated dust. It is recommended to carry out cleaning servicing.
What is "3D i-see sensor" function and benefit?
The "3D i-see sensor" from Mitsubishi Electric uses advanced radiation-based technology with eight rotating sensors to ensure even room temperature distribution, maximising comfort and reducing energy consumption by adjusting AC systems based on real-time data.
*Applicable for selected models
How often should I clean the air filters in my air conditioner?
We recommend to clean the air filters in your air conditioner monthly using tap water.
*Depending on usage and air quality, to maintain optimal performance and air quality
What the difference between single spilt AC and multi split AC?
  • Single Split AC: Consists of one indoor unit connected to one outdoor unit. Ideal for cooling single rooms or spaces.
  • Multi Split AC: Has multiple indoor units connected to a single outdoor unit, allowing different rooms or zones to be cooled independently. Offers flexibility and zoning capabilities but requires more complex installation.
Why my air conditioner cannot turn on after easy clean service?

For models with "Easy Clean" function, kindly ensure the ‘Vane Latch’ is properly secured before turning on the unit.

NOTE:

  • These are general issues. Actual problems may vary by air-conditioner models.
  • For more specific issues, please refer to your product manual to identify the problem occurred or directly contact your dealer / technician.

Repair and Service

Have questions about repairing and servicing your air conditioner? This section covers common repair issues, maintenance tips, and guidance on when to seek professional help. Find answers to keep your air conditioner running smoothly and efficiently.

How often should my air conditioner be serviced?
It is recommended to have regular maintenance performed by a qualified technician to ensure optimal performance, cooling efficiency, and to extend the lifespan of your air conditioner. We advise scheduling maintenance on a yearly* basis.
*Based on the usage and environment, frequency might be differ
Can I chemical clean my air conditioner?
Our AC come with factory fitted hydrophobic coating, any chemical cleaning may wear out or damage the coating. This may effect the performance of the AC unit. Advisable to clean the unit with Plain water.
What do the flashing lights on my air conditioner unit mean?

When the indoor unit is operating and has detected an abnormality, the indoor fan motor will automatically switch OFF, and the upper or left operation indicator lamp will flash.

Indoor unit failure mode table

  • First, check the indoor unit's upper or left operation indicator lamp to see if it is flashing ON and OFF. If the indicator lamp is flashing, it is indicating an abnormality. To identify the error, count how many times the indicator lamp flashed between the delay time.
  • Make sure your horizontal vane is correctly installed. Loose vane installation may also be a reason for the indicator lamp to flash.
Upper Lamp Of Operation Indicator Lamp
Abnormal point
(Failure mode)
Condition
Not lighted
Normal
None (Normal)
1-time flash every 0.5 second
Room temperature thermistor
Room coil temperature thermistor is short/open circuit
2-time flash, 2.5 second OFF
Indoor coil thermistor
Indoor coil temperature thermistor is short/open circuit
3-time flash, 2.5 second OFF
Serial signal
Rotation frequency feedback signal is not emitted during the indoor fan operation
4-time flash, 2.5 second OFF (Inverter only)
Indoor fan motor
Indoor PCB failure
5-time flash, 2.5 second OFF (Inverter only)
Indoor control system
Compressor stops after 3 times of over-current / start-up failure protection within 1 minute after start-up
6-time flash, 2.5 second OFF (Inverter only)
Outdoor thermistors
Outdoor thermistor is short / open circuit
7-time flash, 2.5 second OFF (Inverter only)
Outdoor control system
Indoor / outdoor PCB failure
11-time flash, 2.5 second OFF
Indoor fan motor
Rotation frequency feedback signal is not emitted during 12 seconds the indoor fan operation
14-time flash, 2.5 second OFF
Refrigerant circuit
Unit has been pump down for a long time
Refrigerant amount is low
Unit is short cycling
Outdoor fan motor locks up
What does the code on my controller mean?

NOTE:
  • Press any button to cancel the error code display mode of the remote controller.
  • The error code may not appear if the operation indicator lamp is not blinking.
The error code will be displayed on the remote controller while the upper operation indicator lamp on the indoor unit is blinking. Follow the procedure below to check the error code.

Displaying the error code

  • Make sure the handheld remote controller is powered off.
  • Get nearer in front of the indoor unit (within 2 m), point the remote controller at the receiving section of the indoor unit, and press and hold the small “CHECK” button with a fine-tipped object.
  • While pressing and holding the “CHECK” button, keep pointing the remote controller at the receiving section of the indoor unit until you hear a beep and see the error code (2 digits) on the controller's display.
  • Check the error code table below to identify the issue.
Object
Error Code
Abnormal Point
Indoor unit
00
None (Normal)
E6
Serial Signal
E7
Fb
Indoor control system
P1
Room temperature thermistor
P2
Indoor coil thermistor
P9
Pb
Indoor fan motor
Outdoor unit
E8
Indoor/outdoor communication, receiving error
E9
EC
FC
Nonvolatile memory data
Fd
Different voltage
P8
4-way valve/Pipe temperature
PL
Outdoor refrigerant system
U3
Discharge temperature thermistor
U4
Defrost thermistor
Fin temperature thermistor
P.C. board temperature thermistor
Ambient temperature thermistor
Outdoor heat exchanger temperature thermistor
UE
Stop valve (Closed valve)
UP
Outdoor power system
  • If “--” appears on the display, it means the remote controller has not received the signal from the indoor unit. Press any button to cancel the error code display mode. Get closer to the indoor unit, and try again. If the remote controller is still unable to receive the signal, turn off noise sources (fluorescent lamp, TV, speakers, etc.) and try again.
  • “00” appears on the display when there is no error.
  • When an error code (other than “00”) appears on the display, the air-conditioner needs to be inspected and repaired. Stop using the air conditioner, turn off the breaker, and contact your dealer.

NOTE:

  • These are general issues. Actual problems may vary by air-conditioner models.
  • For more specific issues, please refer to your product manual to identify the problem occurred or directly contact your dealer / technician.

Download R32 Refrigerant Guidelines

Find out more about R32 Refrigerant air-conditioners through this in-depth document we have compiled for your reference.

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R32 Refrigerant Guide (BM version)

Download PDF
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R32 Refrigerant Guide (ENG version)

Download PDF

Warranty

Need information about your air conditioner’s warranty? This section explains coverage details, how to make a warranty claim, and what’s included for repairs and replacements. Get peace of mind by understanding your warranty options.

What does the Mitsubishi Electric Wall Mounted Air Conditioner warranty cover?
The warranty for the Mitsubishi Electric Air Conditioner covers general parts for 2 years (1 year for 3HP units) and the compressor for 7 years (5 years for 3HP units), starting from the purchase date indicated on the Proof of Purchase (e.g., sales invoice, sales receipt, delivery order, etc.). If you present more than one Proof of Purchase, the earlier date indicated in any such Proof of Purchase will be the Purchase Date. For the avoidance of doubt, the installation date shall not be deemed the Purchase Date.
What is not covered by the warranty?
  • Any unit damaged by usage not in accordance with instruction of operation
  • Lack of routine servicing by our authorised dealer
  • Installation not in accordance to installation manual & prevailing government regulation
  • Abnormal voltage including use of private generator
  • Act of God, pests, normal wear & tear, corrosion, rusting & stain resulting from installation in abnormal environmental condition
  • Cabinet, plastic panel, filter strainers, dryers, refrigerant, extruded parts such as knob, levers, bulbs, socket, scratches on the lens, images “burned in” & detachable parts & accessories including remote control unit
  • Transportation & handling charges incurred during delivery of unit to & from our service centre
  • Routing maintenance servicing & any consequential damages or losses arising from unit fault
*Refer to our warranty terms & conditions
Do I need to register my product online?
  • To serve you better, please register your products through our online portal (https://ewarranty.mesm.com.my).
  • Your product warranty will begin once registration is complete and validated. This will make you eligible for warranty service.
Do I need to retain Proof of Purchase after I registered my product warranty online?
Yes, we kindly advise you to keep the email confirmation and Proof of Purchase for verification purposes, even after completing your product warranty registration online. Please ensure that your proof genuinely reflects the date of purchase, as the installation date will not be considered as the Purchase Date.
How to know my product warranty expiry date?
To find out the expiry date, please register your products on our online product registration portal (https://ewarranty.mesm.com.my/)

NOTE:

  • These are general issues. Actual problems may vary by air-conditioner models.
  • For more specific issues, please refer to your product manual to identify the problem occurred or directly contact your dealer / technician.

City Multi Variable Refrigerant Flow (VRF) Air Conditioner

Looking to understand Variable Refrigerant Flow (VRF) systems. This section explains their key concepts and functionality in simple terms.

What is Variable Refrigerant Flow (VRF)?
Variable Refrigerant Flow (VRF) is an advanced Heating, Ventilation and Air Conditioning (HVAC) technology that efficiently controls the flow of refrigerant to multiple indoor units, allowing for customised cooling in different areas of a building.
How does VRF differ from single split system?
Unlike single split system, VRF adjusts refrigerant flow to match specific cooling needs in different areas, saving energy and offering precise comfort control.
What is Coefficient of Performance (COP)?
Coefficient of Performance (COP) measures the energy efficiency of cooling output. A higher COP indicates better energy efficiency, resulting in lower energy costs and environmental impact.

NOTE:

  • These are general issues. Actual problems may vary by air-conditioner models.
  • For more specific issues, please refer to your product manual to identify the problem occurred or directly contact your dealer / technician.

Consult your dealer or technician about any major issues.

If your air-conditioner is diagnosed with a major issue (eg. refrigerant leak, damaged compressor, thermostat malfunction, etc.), contact your dealer, technician, or servicing person. The person servicing your unit should be a certified professional with the expertise to solve the issue. Trying to repair the air-conditioner on your own is not advisable. Check your air-conditioner warranty here.