What does Mitsubishi Electric 16 / LED1 4x, LED2 off mean?
Mitsubishi Electric 16 / LED1 4x, LED2 off is listed as fin temperature or P.C. board temperature protection in Multi-Split rows such as FP Series, Starmex R32. This meaning comes from the manufacturer's own diagnostic material. Confirm the exact model, series, or signal row before accepting a parts quote.
Open, shorted, displaced, or out-of-range thermistor or pressure-sensor reading.
Loose sensor connector, damaged sensor harness, or water-affected wiring.
PCB input fault after the sensor and wiring readings are confirmed.
What to do now
Use these steps before customer action, a sensor check, or PCB quote.
Stop using the unit if 16 / LED1 4x, LED2 off returns
If 16 / LED1 4x, LED2 off remains displayed or returns during operation, do not attempt a reset the manufacturer does not list; arrange diagnosis.
No manufacturer reset steps listed for 16 / LED1 4x, LED2 off
Capture the complete 16 / LED1 4x, LED2 off pattern and model stickers first. The manufacturer lists no customer reset procedure; do not treat a generic power-cycle as manufacturer guidance.
Send these to us
16 / LED1 4x, LED2 off blinking light, a short video of the blinking-light sequence, Mitsubishi Electric model stickers, affected rooms, operating state when the code appeared, and when the fault appears
Guidance for your model
Notes that match the code to your exact model. Electrical, refrigerant, wiring, resistance and component checks are for a technician.
| Detail | What it says |
|---|---|
| Diagnostic note | Do not keep resetting the system if this pattern returns. Record the model number, lamp or LED pattern, and affected rooms before booking diagnosis. |
| Singapore / model note | Official Mitsubishi Electric checklist action: Check refrigerant circuit, refrigerant amount, and outdoor fan motor. |
- Detail
- Diagnostic note
- What it says
- Do not keep resetting the system if this pattern returns. Record the model number, lamp or LED pattern, and affected rooms before booking diagnosis.
- Detail
- Singapore / model note
- What it says
- Official Mitsubishi Electric checklist action: Check refrigerant circuit, refrigerant amount, and outdoor fan motor.
What to check before repair
Use this split to separate safe evidence capture from the tests a technician should prove before quoting parts.
| You can check | Technician should confirm |
|---|---|
| Before taking any system action on 16 / LED1 4x, LED2 off, take a short video of the blinking-light sequence. | Confirm which sensor 16 / LED1 4x, LED2 off maps to on the exact model table. |
| Capture the Mitsubishi Electric indoor and outdoor model stickers so the correct family row is used. | Measure the sensor value against the service-manual resistance or voltage range. |
| The manufacturer lists no customer reset procedure for this code. Note whether one room, several rooms, or the whole system is affected. | Check connector condition, harness continuity, and PCB input before replacing boards. |
- You can check
- Before taking any system action on 16 / LED1 4x, LED2 off, take a short video of the blinking-light sequence.
- Technician should confirm
- Confirm which sensor 16 / LED1 4x, LED2 off maps to on the exact model table.
- You can check
- Capture the Mitsubishi Electric indoor and outdoor model stickers so the correct family row is used.
- Technician should confirm
- Measure the sensor value against the service-manual resistance or voltage range.
- You can check
- The manufacturer lists no customer reset procedure for this code. Note whether one room, several rooms, or the whole system is affected.
- Technician should confirm
- Check connector condition, harness continuity, and PCB input before replacing boards.
What changes the next step
These clues decide whether the first check is room-side, shared outdoor-side, refrigerant-side, listed-meaning, or model-family confirmation.
| What you see | What it points to |
|---|---|
| Only one indoor unit shows 16 / LED1 4x, LED2 off. | The affected room, indoor board path, wiring route, or local component should be checked first. |
| Several rooms or the outdoor unit show the same 16 / LED1 4x, LED2 off fault. | Prioritise the reporting-unit sensor circuit, shared harness path, and control-board input. |
| The fault appears immediately even before the unit cools properly. | Sensor value, connector, harness, and PCB input should be tested in that order. |
| The model family is different from the row you found online. | Use the model or series filter first; same-looking codes can still belong to different diagnostic tables. |
| The model belongs to Multi-Split rows such as FP Series, Starmex R32. | This meaning comes from the manufacturer's own diagnostic material. Match the code to your model's listing before parts are quoted. |
- What you see
- Only one indoor unit shows 16 / LED1 4x, LED2 off.
- What it points to
- The affected room, indoor board path, wiring route, or local component should be checked first.
- What you see
- Several rooms or the outdoor unit show the same 16 / LED1 4x, LED2 off fault.
- What it points to
- Prioritise the reporting-unit sensor circuit, shared harness path, and control-board input.
- What you see
- The fault appears immediately even before the unit cools properly.
- What it points to
- Sensor value, connector, harness, and PCB input should be tested in that order.
- What you see
- The model family is different from the row you found online.
- What it points to
- Use the model or series filter first; same-looking codes can still belong to different diagnostic tables.
- What you see
- The model belongs to Multi-Split rows such as FP Series, Starmex R32.
- What it points to
- This meaning comes from the manufacturer's own diagnostic material. Match the code to your model's listing before parts are quoted.
Sensor or PCB decision
Mitsubishi Electric 16 / LED1 4x, LED2 off is usually repair-first if a sensor or harness reading is confirmed. Board replacement should wait until the sensor circuit is tested.
Sensor replacement is usually targeted when resistance or voltage readings are out of range.
Harness or connector damage can look like a sensor fault until continuity is checked.
PCB replacement is a later step if the sensor and wiring test correctly.
Mitsubishi Electric 16 / LED1 4x, LED2 off questions
What does the Mitsubishi Electric 16 / LED1 4x, LED2 off error mean?
Can I fix a Mitsubishi Electric 16 / LED1 4x, LED2 off error myself?
Is it safe to keep running the aircon with a 16 / LED1 4x, LED2 off error?
What causes a Mitsubishi Electric 16 / LED1 4x, LED2 off error?
Will a Mitsubishi Electric 16 / LED1 4x, LED2 off error need a repair or a full replacement?
What should I send a technician about a Mitsubishi Electric 16 / LED1 4x, LED2 off error?
Where to go next
Confirm the fault
Share the error code, model number and symptoms so we can assess the likely cause.
Not the right code?
Browse the full Mitsubishi Electric list or check a few codes in the same fault category.
Read next
Use these if the quote mentions the parts, checks, or repair path this code points to.