Mitsubishi Error Code Reference — All 48 Codes
Complete Mitsubishi error code cheat sheet. All 48 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 | Guide |
|---|---|---|
| Mitsubishi City Multi P8 / E6 Error Codes | Causes & Fix | Fix → |
| Mitsubishi CNC Alarm 500 | Causes & Fix | Fix → |
| Mitsubishi CNC Alarm Y96 | Causes & Fix | Fix → |
| Mitsubishi E1 Error Code | Indoor/Outdoor Communication Fault Fix | Fix → |
| Mitsubishi E3 Error Code | Indoor Fan Motor Fault Fix | Fix → |
| Mitsubishi E4 Error Code | Causes & Fix | Fix → |
| Mitsubishi E5 Error Code | Causes & Fix | Fix → |
| Mitsubishi E6 AC Error Code | Causes & Fix | Fix → |
| Mitsubishi E7 Error Code | Refrigerant Cycle Fault | Fix → |
| Mitsubishi Elevator Fault Codes | Complete Guide | Fix → |
| Mitsubishi FR Series VFD Fault E6 | Causes & Fix | 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-A800 Fault E7 | CPU Error Causes & Fix | Fix → |
| Mitsubishi FR-D700 VFD Fault Codes | Complete Diagnostic Reference | Fix → |
| Mitsubishi FR-E800 Fault E6 | Causes & Fix | Fix → |
| Mitsubishi Mini Split Blowing Warm Air | Causes & Fix | Fix → |
| Mitsubishi Mini Split E1 Error Code | Indoor Thermistor Fault 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 E9 Error Code | Outdoor Thermistor 2 Fault Fix | Fix → |
| Mitsubishi Mini Split Error Codes | Complete Guide | Fix → |
| Mitsubishi Mini Split Ice on Coils | Causes & Fix | Fix → |
| Mitsubishi Mini Split Leaking Water | 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 Mini Split P8 Error Code | Outdoor Heat Exchanger Overtemperature Fix | Fix → |
| Mitsubishi Mini Split Won't Turn On | Causes & Fix | 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 MSZ-FH12NA Problems & Error Codes | Indoor fan motor errors are most common on the MSZ-FH12NA, caused by obstructions, miswiring, or a failed motor requiring inspection and replacement. | Fix → |
| Mitsubishi MSZ-FS09NA Problems & Error Codes | Indoor fan motor failure is the most common problem on the MSZ-FS09NA. Turn off power, check for obstructions, then use failure mode recall to identify the stored code. | Fix → |
| Mitsubishi MSZ-FS12NA Problems & Error Codes | Communication errors (E6, U4) are most common, usually caused by loose or damaged wiring between indoor and outdoor units or failed circuit boards. | Fix → |
| Mitsubishi MSZ-GL12NA Problems & Error Codes | Communication faults between indoor and outdoor units are most common, usually caused by loose terminal connections or damaged control wiring. | Fix → |
| Mitsubishi P-Series H6 | Outdoor Fan Motor Fix | Fix → |
| Mitsubishi P3 Error Code | Outdoor Coil Thermistor Fix | Fix → |
| Mitsubishi P4 Error Code | Drain System Fault: Causes & Fix | Fix → |
| Mitsubishi P5 Error Code | Drain Pump Fault: Causes & Fix | Fix → |
| Mitsubishi P7 Error Code | System Mode Mismatch Fix | Fix → |
| Mitsubishi P8 Error Code | Causes & Fix | Fix → |
| Mitsubishi PEX City Multi Error Codes (Indoor Unit): Complete Guide | Mitsubishi PEX City Multi indoor unit error codes and fault diagnostics. P-series codes, causes, and technician-level troubleshooting. | Fix → |
| Mitsubishi PUY Air Handler Error Codes | Fault Code Diagnostic Guide | Fix → |
| Mitsubishi U1 Error Code | Causes & Fix | Fix → |
| Mitsubishi U2 Error Code | Causes & Fix | Fix → |
| Mitsubishi U3 Error Code | Causes & Fix | Fix → |
| Mitsubishi U6 Error Code | Causes & Fix | Fix → |
| Mitsubishi U7 Error Code | Refrigerant System Fault | Fix → |