Aircon Error Codes Guide: Daikin, Mitsubishi, Panasonic

Singapore homeowners ask about aircon error codes every week.

Our team finds that the short answer matters, but the context dictates your next step. You need to know if it is a simple filter issue or a failing circuit board. This makes getting the right diagnosis crucial to keeping your cooling system running and your SP Group bill low.

Most service visits confirm that these cryptic numbers are the fastest way to pinpoint a problem. This guide outlines the exact breakdown we use during our own Aircon Repair coverage across the island. You will see exactly how to retrieve these codes and which ones require a professional fix.

Daikin code table (E0-F3 plus most common)

A Daikin error code pinpoints specific component failures, with A3 and U4 being the most frequent issues in local homes.

We see these specific alerts drive recurring service work across Singapore’s humid climate. Water backs up easily, triggering drainage faults before you even notice a leak. Spotting these details early is exactly what iCare technicians do during a routine visit to prevent water damage.

We compile the most common Daikin alerts into a quick reference list. A faulty sensor or a clogged pipe will stop your cooling immediately.

Error Code	Component Issue	Typical Action Required
A3	Drainage system malfunction	Clear clogged drain pipes to prevent water backup.
A5	Freeze protection or overheating	Clean air filters and ensure clear airflow.
U0	Low refrigerant level	Schedule a leak test and professional gas top-up.
U4	Indoor/outdoor communication fault	Requires technician to inspect PCB wiring.

These specific codes account for a huge portion of our daily callouts. Daikin units are highly sensitive to drainage blockages. Keeping the filters clean will often clear the A5 code without any professional help.

Mitsubishi code table

Dealing with a Mitsubishi error code aircon issue highlights system overloads and communication faults, with P8 and E1 being the most common in local flats.

Our 2026 data shows that overheating outdoor units trigger the majority of these alerts. Dense HDB ledges restrict airflow, pushing compressors to their limits during the hottest months. Catching a P8 warning early saves the compressor from permanent damage.

Error Code	Component Issue	Typical Action Required
E1 / E6	Communication failure	Inspect wiring between indoor and outdoor units.
P8	Outdoor unit overheating	Clear obstructions from the outdoor compressor ledge.
U1	Voltage issue or low gas	Power cycle the unit or check for refrigerant leaks.
F2	Indoor fan motor malfunction	Professional motor replacement usually required.

We often find that a simple power reset clears temporary voltage drops causing the U1 alert. Hardware failures like the F2 code require immediate part replacements. You should never ignore a blinking Mitsubishi indicator lamp for more than a day.

Panasonic code table

A Panasonic error code focuses heavily on pressure and sensor readings, frequently displaying H11 or F91 when the system struggles.

Our service logs indicate that refrigerant leaks are the primary cause of the F91 warning. Low gas levels force the system to work harder, which eventually trips the internal safety switches. An early diagnostic check prevents the entire condenser from failing.

Review the standard Panasonic fault list below.

Error Code	Component Issue	Typical Action Required
H11	Indoor/outdoor communication error	Check main power supply and connecting cables.
H99	Abnormal high pressure	Deep clean the dirty outdoor condenser.
F91	Insufficient refrigerant	Professional leak repair and gas recharge.
F95	High discharge temperature	Clean indoor filters to restore proper airflow.

We highly recommend cleaning your filters the moment you see an F95 code. Restricted airflow spikes the internal temperature very quickly. Taking ten minutes to wash the mesh often solves the problem instantly.

For a related deep-dive, see our guide on Aircon Blinking Light: Singapore Troubleshooting Guide.

How to retrieve codes per brand (display, remote, panel)

You can retrieve the specific error code using your aircon remote control by pressing a hidden diagnostic sequence. Each major brand uses a different combination of button holds and beeps to reveal the hidden fault numbers.

Our technicians use these exact methods to pull the diagnostic history from your unit. Doing this yourself saves time and helps us bring the correct spare parts on the first trip. The process takes less than a minute for any brand.

Daikin Retrieval Steps

• Point the remote at the indoor unit.
• Press and hold the “Cancel” button for 5 seconds until “00” blinks on the screen.
• Press “Cancel” repeatedly to cycle through the codes.
• Stop when you hear a long, continuous beep. The code on the screen is your fault.

Mitsubishi Retrieval Steps

• Ensure the aircon is turned off but receiving power.
• Press and hold the “Check” button on the remote using a pointed object.
• Point the remote at the unit and watch the indoor indicator lamp.
• Count the specific number of blinks to match the code in the manual.

Panasonic Retrieval Steps

• Press and hold the “Check” button on the remote for 5 seconds until ”- -” appears.
• Press the Timer UP or DOWN arrow to scroll through the list.
• Listen closely for a continuous beep from the indoor unit.
• The code displayed during the beep is the active error.

We find that most homeowners can easily pull a Daikin or Panasonic code using just the remote screen. Mitsubishi units rely more heavily on counting the LED flashes on the physical panel. You just need a bit of patience to record the exact sequence.

Severity tiers

DIY-safe issues involve basic cleaning like filter washing, while technician-required faults involve gas leaks or electrical communication failures. Our team categorises every call into specific severity tiers to prioritize emergencies across Singapore.

This framing helps you decide whether to grab a sponge or book a service appointment. Minor drainage clogs happen most weeks, and those rarely require a costly overhaul.

Severity Level	Problem Type	Examples	Action
Tier 1 (DIY-Safe)	Airflow blockages, minor clogs	Daikin A5, Panasonic F95	Clean filters and clear the external drain pipe.
Tier 2 (Monitor)	Temporary power spikes	Mitsubishi U1	Reset the breaker, wait 10 minutes, restart.
Tier 3 (Tech Needed)	PCB faults, Gas leaks	Daikin U4, Panasonic F91	Turn off the unit and call a professional.

We urge customers to immediately shut down their systems if a Tier 3 communication error appears. Pushing a failing compressor will only turn a simple repair into a complete replacement. Leaving the power off protects the expensive internal circuit boards from further electrical damage.

Ready to Book?

If you are tired of deciphering confusing aircon error codes, our experts can handle the repair for you. The fastest path is to get a transparent, fixed quote right now. You can simply call +65 3138 2108, message us on WhatsApp, or use the booking form on our contact page.

Our licensed technicians arrive fully equipped to diagnose and resolve these faults on the spot. For more detail on the service itself, see Aircon Repair. Keeping your home comfortable is always the main goal.