What 2502 means
A Mitsubishi Electric CITY MULTI service handbook lists checking code 2502 as a drain-pump abnormality. Detection logic, connectors, resistance values, and applicable components vary by indoor-unit model and generation.
Likely causes and things to check
- Drain water level remains high because the drain pump/lift path is not removing water
- Drain-sensor/heater wiring or connector problem on models that use that detection method
- Indoor control-board detection fault after the drain pump and sensor circuit are proven
Where to start
Record the complete indoor-unit model and controller code, then use the matching service manual. Inspect the pan and discharge path, prove drain-pump operation, check the sensor/connector circuit by the model procedure, and only then condemn the indoor board or order model-specific pump/hose parts.
Model-specific verification
Mitsubishi Electric CITY MULTI service literature lists checking code 2502 as a drain-pump abnormality. Use the manual for the exact indoor-unit model because detection details and component values differ.
Manufacturer reference
Use the manufacturer source below together with the exact model and controller documentation for the equipment being serviced.
Mitsubishi Electric CITY MULTI service manualSafety note
HVAC work can involve high voltage, rotating equipment, pressurized refrigerants, and combustion systems. Use this site as a reference only. Follow the equipment manual, applicable codes, PPE, lockout/tagout, and current refrigerant rules. Field cases and troubleshooting paths are case-specific and are not OEM procedures or universal targets.