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Mitsubishi Electric error codes: what they mean and what to do
Mitsubishis report faults two ways — codes on the remote and blinks of the indoor LED — and neither is obvious. Here is the translation we use daily.
Quick summary
Quick Mitsubishi Electric references: P8 = outdoor unit anomaly, E6/E7 = indoor-outdoor communication, U8 = outdoor fan, P5 = drainage, continuous LED blinking = read the code via remote. Send your code or a blink video to WhatsApp +34 617 307 409 — free orientation.
How to get the code on a Mitsubishi
Two routes depending on the unit:
- Remote with display: many models show the code directly when the fault occurs (P, E, U or F + number). If not, hold CHECK and navigate: the unit beeps at the active code.
- Indoor unit LED: series without a display communicate through blink patterns of the Operation light. The pattern (number of flashes, pause, repeat) is the code. Film it for 10–15 seconds — that is exactly what we need to read it.
Table of frequent Mitsubishi Electric codes
| Code | Meaning | Can you try anything? | Severity |
|---|---|---|---|
| P1 | Intake temperature sensor | 5-min reset at the breaker | Medium |
| P2 | Indoor coil sensor | Reset; if it repeats, the sensor | Medium |
| P5 | Drainage / condensate pump | Check the visible drain; don't force anything | Low-medium |
| P6 | Freeze/overheat protection | Wash filters; check the grilles aren't covered | Medium |
| P8 | Outdoor unit anomaly | Clear leaves/obstructions; one reset | High if it repeats |
| E0 / E3 | Remote communication | Fresh batteries; aim straight at the receiver | Low |
| E6 / E7 | Indoor ↔ outdoor communication | 5-min reset; if it repeats, wiring/board | Medium-high |
| U8 | Outdoor unit fan | Check nothing blocks the blades | Medium |
| F (blinks) | Inverter faults by pattern | Film the pattern | Variable — technician |
Mitsubishi uses different tables per family (M-Series, Mr. Slim, City Multi). With the model (indoor unit label) and the code or video, we tell you exactly what it is.
The special case: "it works, but it smells / drips / clicks"
Half the Mitsubishi calls we attend are not codes but display-less symptoms: the click-click at start-up (normal expansion, or a dirty blower), the drip in mid-August (code P5 in the making: a drain asking for its clean) and the damp smell (biofilm in the tray — the deep clean removes it). None of the three improves by waiting; all three are single-visit fixes when caught early.
FAQ
Mitsubishi Electric error codes: what they mean and what to do — FAQ
My Mitsubishi shows P8 — is it the compressor?
P8 flags an outdoor anomaly, which includes the compressor but also sensors, the board, or simply a dirty coil choking the unit. We measure before sentencing: half the P8s we see are not the compressor.
The LED blinks but the unit works — ignore it?
Don't: some patterns are preventive warnings (maintenance, a degrading sensor) announcing August's breakdown. Film the pattern and send it — we tell you by message whether it is "can wait" or "better now".
Can a basic remote read codes?
Basic remotes don't show codes: on those series you read the indoor LED blinks. A 10–15 second video of the pattern plus the model — that identifies it.
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Blink filmed, mystery solved.
LED video or code photo via WhatsApp — we read it free before any visit.