Mitsubishi MSZ-AS HVAC System Error Codes

MSZ-AS24NA, MSZ-AS36NA, MSZ-AS42NA, MSZ-AS50NA. Fuel: electric. 20 error codes documented.

Severity breakdown: 20 warning

Error Codes

Code Description Severity
1 Indoor/Outdoor Mismatch Warning
2 Power Supply Phase Error Warning
3 Communication Error Warning
4 Inverter Error Warning
5 Outdoor Thermistor Open/Short Warning
6 Indoor Freeze/Overheat Warning
7 Outdoor Freeze/Overheat Warning
E6 Indoor/Outdoor Communication Error Warning
E9 Indoor/Outdoor Communication Fault Warning
P1 Intake Sensor Error Warning
P2 Indoor Pipe Thermistor Error Warning
P4 Drain Sensor Error Warning
P5 Drain Pump Error Warning
P6 Coil Freeze/Overheat Protection Warning
P8 Pipe Temp Error Warning
U1 High Pressure Trip Warning
U2 Low Voltage/Overcurrent Warning
U3 Discharge Thermistor Short/Open Warning
U4 Outdoor Thermistor Short/Open Warning
U5 Abnormal Condenser Temp Warning

Cross-Reference: Shared Codes with Other Mitsubishi Models

Model Type Shared Codes Unique to That Model
M-Series — 20 / 20 —
P-Series — 20 / 20 —
Diamond Series — 20 / 20 —
City Multi (VRF) — 20 / 20 —
Ducted Systems — 20 / 20 —
MSZ-FS — 20 / 20 —
Diamond Plus — 20 / 20 —
MSZ-FE — 20 / 20 —
MSZ-AP — 20 / 20 —
PUMA — 20 / 20 —
Puff (P-Series) — 20 / 20 —
Diamond (PJ) — 20 / 20 —
City Multi (Y) — 20 / 20 —
MUZ-FE Series — 20 / 20 —
MSZ — 20 / 20 —
PUMY — 20 / 20 —
MSZ-FD — 20 / 20 —
MSZ-FT — 20 / 20 —
MSZ-FY — 20 / 20 —
MSZ-GE — 20 / 20 —
MSZ-LV — 20 / 20 —
MSZ-FS/FD Series — 20 / 20 —
MSZ-AP Series — 20 / 20 —
MSZ-AP5 Series — 20 / 20 —
MSZ Series — 20 / 20 —