Mitsubishi Electric aircon 11 / LED1 4x, LED2 off blinking light
Use this Mitsubishi Electric 11 / LED1 4x, LED2 off blinking light guide to decide when to stop resetting, what to capture, and what to check before parts are quoted.
What does Mitsubishi Electric 11 / LED1 4x, LED2 off mean?
Mitsubishi Electric 11 / 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. The loaded row is source-backed by official 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 another reset, sensor check, or PCB quote.
Stop using the unit if 11 / LED1 4x, LED2 off returns
If 11 / LED1 4x, LED2 off returns after one reset, stop repeated restarts and get the matching source row diagnosed.
Reset 11 / LED1 4x, LED2 off once
Capture the 11 / LED1 4x, LED2 off pattern first, then power-cycle once only and note whether the same fault returns.
Send these to us
11 / LED1 4x, LED2 off blinking light, a short video of the blinking-light sequence, Mitsubishi Electric model stickers, affected rooms, reset result, and when the fault appears
Source-specific guidance
These diagnostic-reference notes help match the code to the exact model. Electrical, refrigerant, wiring, resistance, and component checks are technician work, not DIY steps.
| Source detail | What it says |
|---|---|
| Source repair action | 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. |
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 resetting 11 / LED1 4x, LED2 off, take a short video of the blinking-light sequence. | Confirm which sensor 11 / 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. |
| Note whether one room, several rooms, or the whole system is affected, plus whether it returns after one reset. | 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, source-table, or model-family confirmation.
| What you see | What it points to |
|---|---|
| Only one indoor unit shows 11 / 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 11 / LED1 4x, LED2 off fault. | The shared outdoor side, power path, communication trunk, or refrigerant circuit needs priority checking. |
| 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. | The loaded row is source-backed by official diagnostic material. Use the matching source row before quoting parts. |
Sensor or PCB decision
Mitsubishi Electric 11 / 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 11 / LED1 4x, LED2 off questions
What does the Mitsubishi Electric 11 / LED1 4x, LED2 off error mean?
Can I fix a Mitsubishi Electric 11 / LED1 4x, LED2 off error myself?
Is it safe to keep running the aircon with a 11 / LED1 4x, LED2 off error?
What causes a Mitsubishi Electric 11 / LED1 4x, LED2 off error?
Will a Mitsubishi Electric 11 / LED1 4x, LED2 off error need a repair or a full replacement?
What should I send a technician about a Mitsubishi Electric 11 / LED1 4x, LED2 off error?
Confirm the fault
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Use these if the quote mentions the parts, checks, or repair path this code points to.