Mitsubishi Error Code Reference — All 22 Codes
Complete Mitsubishi error code cheat sheet. All 22 fault codes with plain-English explanations and direct links to fix guides.
Use this page when your Mitsubishi furnace, air conditioner, heat pump, or mini split is flashing a fault. Start with the exact code, then open the fix guide to diagnose airflow, ignition, sensor, pressure switch, board, or communication problems before you order parts or book a service call.
Tip: search the exact brand, model, and code together, for example "Mitsubishi error code 13" or "Mitsubishi pressure switch fault".
| Error Code | What It Means | Often a cheap fix? | Guide |
|---|---|---|---|
| Mitsubishi City Multi P8 / E6 Error Codes | Causes & Fix | — | Fix → |
| Mitsubishi E5 Error Code | Causes & Fix | — | Fix → |
| Mitsubishi E6 AC Error Code | Causes & Fix | — | Fix → |
| Mitsubishi Elevator Fault Codes | Complete Guide | — | Fix → |
| Mitsubishi FR-A800 Fault E.OC1, Overcurrent During Acceleration Fix | What Mitsubishi FR-A800 Fault E.OC1 means, why overcurrent happens during acceleration, and how to diagnose the motor, load, and parameter causes. | — | Fix → |
| Mitsubishi FR-D700 VFD Fault Codes | Complete Diagnostic Reference | — | Fix → |
| Mitsubishi FR-E800 Fault E6 | Causes & Fix | — | Fix → |
| Mitsubishi Mini Split E6 Error Code | Communication Error Indoor/Outdoor Fix | — | Fix → |
| Mitsubishi Mini Split E6 Error Code Fix | Mitsubishi mini split E6 error code means a communication failure between the indoor and outdoor units. Here's how to diagnose wiring, boards, and connection issues. | — | Fix → |
| Mitsubishi Mini Split Error Codes | Complete Guide | — | Fix → |
| Mitsubishi Mini Split Making Noise | Causes & Fix | — | Fix → |
| Mitsubishi Mini Split Not Cooling | Causes & Fix | — | Fix → |
| Mitsubishi Mini Split P1 Error Code Fix | Mitsubishi P1 error code means the indoor coil froze up or refrigerant charge is low. This guide walks you through thawing, diagnosing, and fixing the root cause. | — | Fix → |
| Mitsubishi Mini Split P2 Error Code | Indoor Pipe Thermistor Fix | — | Fix → |
| Mitsubishi Mini Split P6 Error Code Fix | Mitsubishi mini split P6 error code means the condensate float switch tripped — water is backing up in the drain pan. Fix it yourself with this step-by-step guide. | — | Fix → |
| Mitsubishi MR-J4 Servo Amplifier Alarm Codes | AL.10, AL.16, AL.30, AL.50 Fix | — | Fix → |
| Mitsubishi Mr. Slim Error Codes: Complete Guide | Complete Mitsubishi Mr. Slim error code guide. Covers all P, E, and U-series fault codes for commercial Mr. Slim PUHZ, PEA, and PKAA series units. | — | Fix → |
| Mitsubishi P-Series H6 | Outdoor Fan Motor Fix | — | Fix → |
| Mitsubishi P3 Error Code | Outdoor Coil Thermistor Fix | — | Fix → |
| Mitsubishi P5 Error Code | Drain Pump Fault: Causes & Fix | — | Fix → |
| Mitsubishi P7 Error Code | System Mode Mismatch Fix | — | Fix → |
| Mitsubishi PUY Air Handler Error Codes | Fault Code Diagnostic Guide | — | Fix → |