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Mitsubishi Electric Air Conditioner E0-E5 Error Code
Wall controller communication error. Here is what it means and how to clear it, easiest fix first.
The wired wall controller and the indoor unit aren't exchanging signals properly, or the controller's own board has a fault. A loose controller cable, electrical interference or a failed controller are typical causes.
E0 and E3 are transmission errors from the remote controller, E1 and E2 point to the controller's board, and E4 and E5 to signals between the controller and the indoor unit. These apply to wired controllers; handheld wireless remotes don't generate them.
How to fix Mitsubishi Electric E0-E5
Reset the power at the breaker
Switch off the breaker that feeds the air conditioner (some systems have separate breakers for the indoor and outdoor units, so switch off both). Wait about five minutes, switch the power back on and restart the unit to see if the code clears.
Check the controller
Make sure the wall controller sits firmly on its back plate and that nothing has damaged its cable where it's visible. Don't open the controller or pull out wiring.
When to call a technician
If the code returns, a technician needs to test the controller and its wiring.
Parts that commonly cause E0-E5
- wired remote controller
- controller cable
- indoor control PCB
Order parts by your exact model number so they fit.
Other Mitsubishi Electric air conditioner codes
- Blinking OPERATION lightWall unit's indicator light is flashing
- P1Room air temperature sensor fault
- P2 / P9Indoor coil temperature sensor fault
- P4 / P5Drain sensor or drain pump problem
- PAShut down to prevent a water leak
- P6Freeze or overheat protection
- P8Pipe temperature error
- PbIndoor fan motor error
- FbIndoor control board error
- E6 / E7 / E9Indoor and outdoor units aren't communicating
- U1 / UdHigh pressure or overheat protection
- U2Discharge temperature too high or low refrigerant
- U3 / U4Outdoor temperature sensor fault
- U6 / UP / UFCompressor overcurrent
- U8Outdoor fan stopped
- U9 / UHPower supply or current sensor problem
- PLRefrigerant circuit abnormal
Frequently asked questions
What does E0-E5 mean on a Mitsubishi Electric air conditioner?
The wired wall controller and the indoor unit aren't exchanging signals properly, or the controller's own board has a fault. A loose controller cable, electrical interference or a failed controller are typical causes.
Can I fix Mitsubishi Electric E0-E5 myself?
Often. The first steps above are safe checks a homeowner can do. If they don't clear E0-E5, the cause is likely a worn part that needs replacing.
What if E0-E5 keeps coming back?
A code that returns after a reset and the checks above usually means a part is wearing out. Note when E0-E5 appears (which cycle, how often) and have your model number ready; it helps a technician bring the right part on the first visit.
Last reviewed 2026-10-19. Codes and steps can vary by model; check your owner's manual.