How do I read the error code on a Mitsubishi Electric AC — and what do the common ones (like E6/E7) mean?
Our Mitsubishi Electric split has thrown a fault — there's a code showing on the wired controller and the indoor unit's light was blinking earlier. I don't want to just start swapping parts.
- How do I actually read the code on a Mitsubishi Electric unit?
- What do the common ones mean — I think I saw an E6?
- Is any of it safe to sort myself, or is this a technician job?
Not looking for a random online list — I've read those disagree with each other.
3 answers
Good call not trusting the random lists — Mitsubishi's codes are model-specific and the aggregator tables cause more wrong-part swaps than they fix. Here's how it actually works.
How a Mitsubishi Electric unit shows a fault - On systems with a wired remote (the MA/PAR controllers) the error/check code shows on the controller display, usually with the unit or refrigerant address. These units also log past codes, so a tech can pull the history. - On units without a wired remote, the indoor unit's indicator LED blinks a pattern — you read it by the flash count.
Read it properly: note the code exactly, then match it against Mitsubishi Electric's own error-code lookup — they publish one — rather than a third-party table, because the same code can differ across their platforms.
Your E6 (and the related E7): these point to an indoor↔outdoor communication fault — the two units aren't talking. It's usually the interconnect wiring, a loose terminal or a control PCB (occasionally just the order the units were powered up in). That's a technician job — mains wiring and boards, not a DIY.
What's safe to do first (the codes that point here are the mild ones): clean the filters, check the outdoor unit isn't blocked or sitting in recirculated hot air, and power-cycle at the isolator for a few minutes to clear transient faults. If the code comes straight back — especially a communication, sensor or pressure/protection code — don't keep resetting it; book AC repair and maintenance to pull the code and confirm the cause.
Different brand? Same method — read the code, then match it against that brand's own list: Daikin · LG · Samsung · Gree · Midea · O General · Super General · Carrier · Panasonic. New to error codes generally? Start with how to read any AC error code.
From the electrical side: an E6/E7 comms fault is very often the interconnect cable between indoor and outdoor — a nicked core, a loose terminal, or moisture in a junction — rather than a dead board. But diagnosing that means working in the mains-side terminals of both units, so it's genuinely not a DIY. Kill the power at the isolator, not just the remote, and let a tech meter it out; boards get swapped needlessly all the time when it was a wiring fault all along.
Had an E6 on ours and assumed the worst. Turned out a rodent had nibbled the interconnect wire between the indoor and outdoor units — the tech read the code, went straight to the cabling and found it in minutes. Cheap fix in the end. Very glad I didn't let anyone start replacing PCBs off a guessed code.
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