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Aircon Error Codes Singapore: Daikin, Mitsubishi, Panasonic, Midea & LG Guide

Islandwide Aircon Service · Daily 8:30 AM–6:00 PMCall +65 8518 4997 · 3025 Ubi Road 3, #03-121, Singapore 408653

Updated July 2026 · By Singapore Aircond Service Centre

When your aircon stops and flashes a code, that code tells you exactly where to look — if you know how to read it. This reference covers the most common error codes for the five biggest aircon brands in Singapore. Bookmark it: it can save you a wasted service call, or tell you when a problem genuinely needs a technician.

Before You Do Anything: The 5-Minute Reset

Many error codes are one-off glitches. Before booking a repair: switch the unit off at the remote, then turn off the power at the breaker or isolator for 5 minutes, and restart. If the code returns, use the tables below.

Daikin Error Codes

Code Meaning DIY or Technician?
A3 Drain water level abnormal — clogged drain pipe or failed drain pump Technician (drainage clearing)
A5 Anti-freeze protection — dirty coil or low refrigerant Technician (wash or gas check)
E7 Outdoor fan motor fault Technician
U0 Refrigerant shortage Technician (leak check + top-up)
U4 Indoor–outdoor communication error Try reset; technician if repeats

More on our Daikin servicing page.

Mitsubishi Electric (Starmex) Error Codes

Code Meaning DIY or Technician?
P5 Drain overflow protection — drainage likely choked Technician
P8 Abnormal pipe temperature — dirty filters/coil or gas issue Clean filters first; technician if repeats
E6 Indoor–outdoor communication fault Try reset; technician if repeats
U8 Outdoor fan abnormal Technician
Blinking operation light Self-diagnosis signal — count the blinks and note the pattern WhatsApp us the pattern

More on our Mitsubishi servicing page.

Panasonic Error Codes

Code Meaning DIY or Technician?
H11 Indoor–outdoor communication failure Try reset; technician if repeats
H16 Outdoor current transformer issue Technician
F11 4-way valve switching abnormality Technician
F90 Power factor correction protection Technician
F91 Refrigeration cycle abnormal — usually low gas Technician (leak test)

More on our Panasonic servicing page.

Midea Error Codes

Code Meaning DIY or Technician?
E1 Indoor–outdoor communication error Try reset; technician if repeats
E3 Indoor fan speed abnormal Technician
E5 Outdoor unit protection — voltage or airflow Check condenser not blocked; then technician
EC Refrigerant leak detected Technician (leak check + top-up)
P0 IPM module protection — inverter fault Technician

More on our Midea servicing page.

LG Error Codes

Code Meaning DIY or Technician?
CH01 / CH02 Air / pipe temperature sensor fault Technician (sensor swap)
CH05 Indoor–outdoor communication fault Try reset; technician if repeats
CH10 Indoor fan motor fault Technician
CH38 Refrigerant shortage Technician (leak check + top-up)

More on our LG servicing page.

Three Rules That Save You Money

  1. Codes about drainage (A3, P5) — stop using the unit; continued running can flood your wall. This is usually a quick, inexpensive fix.
  2. Codes about refrigerant (U0, F91, EC, CH38) — insist on a leak check before any gas top-up. Gas does not run out on its own.
  3. Communication faults (U4, E6, H11, E1, CH05) — often cleared by a power reset. If it returns within days, wiring or a control board needs attention.
Aircon showing a code that is not listed? Error meanings vary by model. WhatsApp us the code + your model number and we will tell you what it means before you book anything: +65 8518 4997 · Repair & troubleshooting service

Frequently Asked Questions

Can I keep using the aircon when an error code shows?

For drainage codes, no — you risk water damage. For most other codes the unit protects itself by stopping. Do the 5-minute power reset once; if the code returns, book a diagnosis.

How much does it cost to fix an error code?

It depends on the cause: drainage clearing and sensor swaps are inexpensive, while PCB or compressor faults cost more. We diagnose on site and quote before any work begins.

Why does my error code keep coming back after reset?

A recurring code means a real hardware fault, not a glitch — most commonly dirty coils, a choked drain, a failing sensor or low refrigerant. Repeated resets only delay the fix.

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Aircon Freezing: Causes & Solutions

Islandwide Aircon Service · Daily 8:30 AM–6:00 PMCall +65 8518 4997 · 3025 Ubi Road 3, #03-121, Singapore 408653

Step-by-Step Solutions to Resolve Aircond Freezing Issues

Part 1: Possible Causes of Air Conditioning Freezing and Their Symptoms

 

1. Low Refrigerant Levels

– Symptoms: Reduced cooling efficiency, air from the AC is not as cold as it should be.
– Cause: Low refrigerant levels can cause the evaporator coils to drop in temperature excessively, leading to freezing.

 

2. Poor Airflow

– Symptoms: Unusual noises from the AC unit or reduced air output.
– Cause: Blocked air filters or internal pathways restrict airflow, causing the evaporator coils to get too cold and freeze.

 

3. Dirty Evaporator Coils

– Symptoms: Unpleasant odors when AC is running, decreased cooling efficiency.
– Cause: Accumulation of dust and dirt on the evaporator coils affects their functioning, leading to freezing.

4. Mechanical Failures

– Symptoms: Loud operation noises or frequent cycling on and off.
– Cause: Issues like a faulty expansion valve or compressor can disrupt the normal flow of refrigerant, causing freezing.

Part 2: Step-by-Step Solutions to Resolve Freezing Issues

Basic Solutions

1. Turn Off and Unplug the AC

– Ensure safety and prevent further damage by turning off the unit before any maintenance.

2. Check and Clean the Air Filters

– Remove the filters and either wash them or clean off the dust with a vacuum cleaner.
– Make sure the filters are completely dry before reinstalling them.

3. Inspect the Outdoor Unit for Ventilation

– Ensure there are no obstructions around the outdoor unit, such as leaves, dust, or debris.

4. Restart the Air Conditioner

– Turn the AC back on and observe if the freezing issue persists.

Advanced Solutions

1. Check Refrigerant Levels

– This typically requires a professional. If the refrigerant is low, it may need to be refilled or leaks may need to be repaired.

2. Clean the Evaporator Coils

– Gently clean the coils using a specialized cleaner and a soft brush.
– Be careful to avoid damaging the coils during cleaning.

3. Inspect and Repair Mechanical Components

– If there are issues with critical components like the expansion valve or compressor, contact a professional for inspection and repair.

– Regularly schedule professional maintenance checks to prevent freezing and other issues.

 

By following these steps, you can effectively diagnose and resolve issues of freezing in your air conditioner. Basic solutions are suitable for regular maintenance, while advanced solutions may require some expertise or the assistance of a professional.

Regular maintenance and timely troubleshooting are key to ensuring efficient operation of your AC unit.

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