If your Mitsubishi aircon timer light or operation indicator lamp gives four blinks or flashes and then turns off for 2.5-seconds, that means an abnormality is detected in the indoor fan motor and subsequently a failure in the indoor PCB or the electronic control circuit board. Both parts are relatively easy to access and check since they are part of the indoor AC component. Plus, if you’ve already been doing HDB’s recommended maintenance checks, you might have already seen the aforementioned parts of the indoor unit.
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Mitsubishi aircon light blinking (full guide)
Table of Contents
- Meaning of Four Blinks or Flashes on the Mitsubishi AC Timer Light
- Understanding the Mitsubishi Indicator Lamp and Identifying the Error
- Troubleshooting the Error Code Indicated by 4 Blinks on the Mitsubishi AC Timer Light
- Estimated Cost of Repairing the Error Indicated by 4 Blinks on the Mitsubishi AC Timer Light
- Conclusion
Your Mitsubishi air conditioning unit uses the AC timer light to signal an error and communicate the likeliest source of the error. Once an error is detected and its most probable source identified, the indoor fan motor will instantly switch off and the upper or left operation indicator lamp or AC timer light will blink or flash in specific time intervals. The number of blinks or flashes corresponds to a particular error code. But before you start diagnosing the error, check first if the horizontal aircon vane is properly fitted and secure. If the flaps are loose, the indicator lamp may also flash.
To indicate an abnormality, the upper or left operation indicator lamp of the indoor sub-unit of your Mitsubishi AC will start blinking on and off. To know the corresponding error code, count the number of blinks between the delays. The interval between the blinks lasts for one half of a second, while the interval between each blinking error code pattern is 2.5 seconds.
A troubleshooting code guide can be found on the right side of the indoor unit of your Mitsubishi AC. You can also use that as a quick reference. To address an error signaled by the indicator lamp flashing four times, check both the indoor fan motor and the PCB control board for dirt, damage, obstruction, or loose connections and fittings. If it’s only a minor issue and not a serious electrical malfunction in the control circuit board, basic troubleshooting will probably clear the error without a hitch. Otherwise, you will need professional help to get your Mitsubishi air conditioning unit to run normally again. You might have a non-inverter Mitsubishi model, which we cover as well.
Silverback Aircon is perfectly capable of getting to the bottom of (and ultimately solving) the persistent error in your Mitsubishi indoor sub-unit. We have a well-maintained and inventoried stockpile of refurbished Mitsubishi aircon spare parts, in case your indoor fan motor or indoor circuit board is found to be defective. We’ve also had a lot of experience repairing faulty Mitsubishi air conditioning units all over homes in Singapore. Moreover, if professional aircon maintenance is all that is needed to clear the fault from your Mitsubishi AC, Silverback Aircon offers numerous servicing options, too.
The following table has a summary of the indoor components most closely linked to the error code of four blinks that you are seeing on the Mitsubishi AC timer light. The corresponding estimated cost of replacing defective units is also indicated.
Silverback Aircon provides free consultation over Whatsapp to assist you with the lingering error on your Mitsubishi air conditioning unit. And to properly assist you, we will also ask for the model number of the fan coil unit, which you can find on the underside of the indoor unit of the AC. Note the model number down and give us a call so we can get your Mitsubishi aircon back up and running again.
