Flashing Indicator Light
Mitsubishi Electric Air Conditioner
Severity:What Does This Error Mean?
A flashing light on a Mitsubishi Electric indoor unit indicates a fault code. Count the number of rapid flashes from the Operation indicator, note the pattern, and look it up in the fault code table in your installation manual.
Affected Models
- Mitsubishi Electric MSZ Series
- Mitsubishi Electric SRK Series
- Mitsubishi Electric MSZAP Series
Common Causes
- Any system fault — the flash count identifies the specific error
- Slow flashing = timer or schedule active (not an error)
- Rapid continuous flashing = fault requiring diagnosis
How to Fix It
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Identify which light is flashing.
Mitsubishi Electric indoor units typically have an Operation indicator (green) and a Timer indicator. A slowly flashing or solid Timer light simply means a timer is programmed — this is normal. A rapidly flashing Operation light indicates a system fault.
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Count the flash sequence.
Watch the Operation indicator and count how many times it flashes rapidly before a pause. The number of flashes corresponds to an error code in Mitsubishi Electric's fault code table. For example: 6 rapid flashes = Error 6 (varies by model series).
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Look up the fault code.
Common Mitsubishi Electric flash codes: 2 flashes = outdoor unit fault 3 flashes = indoor fan fault 4 flashes = drain pump / float switch 6 flashes = outdoor unit communication fault 8 flashes = outdoor unit overheat 9 flashes = compressor over-current Always cross-reference with your model's installation manual for exact meanings.
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Try a power reset.
Turn off at the circuit breaker for 5 minutes, then restore power. Communication faults and transient errors (such as 2 or 6 flashes) often clear after a reset. If the same flash code returns, the fault is confirmed and needs professional repair.
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Contact a Mitsubishi Electric technician.
Provide the flash count to the technician when booking. Having the exact flash code helps them bring the correct parts and speeds up the repair.