Mitsubishi Heavy Aircon Owner's Guide: Codes and Repair

Use these first if your Mitsubishi Heavy Industries unit is already showing a blinking light, error code, or repeat fault.

Mitsubishi Heavy Industries and Mitsubishi Electric are separate companies. They share no parts, codes or service network. The SRK wall-mount is the common residential line, the SCM outdoor serves multi-split homes, and the FDT/FDC cassette covers open-plan and commercial spaces.

NEA registers the single-split outdoor units with the SRC prefix, while the multi-split systems use SCM codes and indoor heads carry SRK names. The register rows below are current as of the retrieval date, and registration expiry is listed for each. Match the outdoor code and the indoor name together before using any fault table.

Mitsubishi Heavy's published terms do not say when cover begins. It may start at purchase or at installation, so settle the date in writing when you buy the unit.

The cover splits into a short general period and a longer compressor term. The general period governs the faults owners actually meet: fan motors, boards, thermistors and drains. The compressor term supplies the part, while labour, refrigerant and the work around it remain chargeable.

Registration links the model and serial to a purchase record, and second-hand units may carry nothing transferable to the new owner. Servicing is excluded from cover but still expected as a condition, so keep the invoices.

MHI reports faults in two ways. Display panels show E-prefix codes, while older SRK units use a two-lamp blink pattern. On those lamp models, the operation light counts the tens digit and the timer light counts the units digit. The code can be hard to read at a glance.

The residential code set follows consistent categories. E7 is a room temperature sensor fault, E9 points at the drain, and E16 covers the indoor fan motor. E5 covers signal transmission, E35 is cooling high-pressure protection, and E36 is compressor overheat protection.

The physical patterns have a shape. Sensor and drain faults show up first on older units. Compressor lockouts cluster on the hottest afternoons, and control board faults arrive later in life. A locked-out outdoor unit needs testing before anyone assumes a gas top-up.

The model group decides which fault row applies. A residential SRK row does not carry across to a commercial PAC or KX unit, even where the code looks familiar. The Mitsubishi Heavy error codes lookup keeps those groups separate, so confirm the group from the model code first.

Drainage faults deserve their own note. They are common to every split system in Singapore and often sit with the installation rather than the unit, which matters because the installer's workmanship terms run alongside the brand cover.

Three factors frame the decision on MHI: parts supply, technician familiarity, and age. The first two separate it from the more common Japanese brands.

Fewer local stockists hold MHI parts, so a quote should name the component and confirm it can be obtained before work is approved. Fewer technicians work on the brand regularly, which raises the cost of a misread code.

Age sets the third part of the frame. The bands below describe when the comparison tends to shift, not what any particular fault will cost.

Send the indoor model number, the brand name written out in full, the code or blink pattern, and which rooms lost cooling. MHI and Mitsubishi Electric share a name and nothing else, so the brand line prevents the wrong table being opened.

If the unit may still be under cover, add the purchase invoice and any installation record. The published terms do not state the start date, so those papers settle it.

The Mitsubishi Heavy warranty guide covers the start date and what the compressor term pays for. The Starmex vs heavy industries comparison settles the name question. The Mitsubishi Heavy vs Panasonic comparison covers the mid-tier shortlist.