Mitsubishi Electric aircon FR01 / recall upper lamp 1x
Use this Mitsubishi Electric FR01 / recall upper lamp 1x guide to capture the fault correctly and see what should be checked before parts are quoted.
What does Mitsubishi Electric FR01 / recall upper lamp 1x mean?
Mitsubishi Electric FR01 / recall upper lamp 1x is listed as room temperature thermistor short or open in Inverter Split, Multi-Split rows such as FN Series, MSXY-FN. 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 customer action, a sensor check, or PCB quote.
Treat it as a fault signal
If FR01 / recall upper lamp 1x remains displayed or cooling is still abnormal, preserve the code and arrange diagnosis.
No manufacturer reset steps listed for FR01 / recall upper lamp 1x
Capture the complete FR01 / recall upper lamp 1x pattern and model stickers first. The selected source row lists no customer reset procedure; do not treat a generic power-cycle as manufacturer guidance.
Send these to us
FR01 / recall upper lamp 1x 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
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 |
|---|---|
| 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 the room temperature thermistor connection and resistance. |
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 FR01 / recall upper lamp 1x, take a short video of the blinking-light sequence. | Confirm which sensor FR01 / recall upper lamp 1x 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 selected source row lists no customer reset procedure. Note whether one room, several rooms, or the whole system is affected. | 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 FR01 / recall upper lamp 1x. | The affected room, indoor board path, wiring route, or local component should be checked first. |
| Several rooms or the outdoor unit show the same FR01 / recall upper lamp 1x 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 Inverter Split, Multi-Split rows such as FN Series, MSXY-FN. | The loaded row is source-backed by official diagnostic material. Use the matching source row before quoting parts. |
Sensor or PCB decision
Mitsubishi Electric FR01 / recall upper lamp 1x 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 FR01 / recall upper lamp 1x questions
What does the Mitsubishi Electric FR01 / recall upper lamp 1x error mean?
Can I fix a Mitsubishi Electric FR01 / recall upper lamp 1x error myself?
Is it safe to keep running the aircon with an FR01 / recall upper lamp 1x error?
What causes a Mitsubishi Electric FR01 / recall upper lamp 1x error?
Will a Mitsubishi Electric FR01 / recall upper lamp 1x error need a repair or a full replacement?
What should I send a technician about a Mitsubishi Electric FR01 / recall upper lamp 1x error?
Confirm the fault
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