Mitsubishi Electric Mini-Split 5 blinks: Outdoor power system abnormality
Updated October 2026 · Sourced from Mitsubishi Electric documentation
🛑 Turn it off and call a licensed pro
The compressor stopped 3 times in a row within 1 minute of startup for overcurrent protection or startup failure protection, and the units do not operate.
Is it safe to keep running? No. Turn it off and get it checked. Turn the unit off and call a licensed technician. The manual also lists checking the stop valve.
5 blinks at a glance
| Code / how it shows | Meaning | Applies to |
|---|---|---|
| 5 blinks Left OPERATION INDICATOR lamp blinks 5 times, then 2.5-second pause | Outdoor power system abnormality | MSZ-AP15VG / MSZ-AP20VG wall-mounted indoor units (OBH838 service manual) |
🛑 Stop and call a licensed pro if
- Turn the unit off and call a licensed technician. The manual also lists checking the stop valve.
- Any code pointing to refrigerant, the compressor, high pressure or the outdoor unit board. Refrigerant work legally needs a certified technician.
- Burning smell, sparks, or a breaker that trips again after a reset.
- Water leaking from the indoor unit that does not stop after the drain is clear.
Safe first steps for any Mitsubishi Electric code
- Write down the exact code and how it shows (remote display or number of lamp blinks). Similar codes mean different things on different series.
- Turn the system off at the remote, switch off the breaker or disconnect for the unit, wait a few minutes, then turn it back on.
- Clean or replace the indoor unit air filters, and make sure nothing blocks the indoor or outdoor unit.
- Check that the condensate drain line is not blocked or kinked where you can see it.
- Replace the remote controller batteries if the display is dim or the unit does not respond.
Source: Mitsubishi Electric MSZ-AP15/20VG Indoor Service Manual OBH838, p.22 (10-4 Troubleshooting check table). Codes are series-specific, so your unit's own manual is the final word. Reviewed October 2026.
Shaun Cain · Certified HVAC & Refrigeration Technician · Ask an HVAC technician
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