Original complaint
An indoor unit/controller displayed checking code 2502 and condensate removal components needed to be identified.
- Controller displayed 2502
- Drain pump and hose path became the primary diagnostic area
- Correct pump/hose part identification depended on the exact indoor-unit model
Measurements taken
- Displayed checking code
- 2502
Diagnostic process
- 1Recorded the exact displayed code rather than clearing it first
- 2Verified the indoor-unit model/service literature before assigning the code meaning
- 3Inspected the drain pan, lift pump, hose/check path, sensor/connector, and discharge route
- 4Separated a blocked drain or failed pump from sensor/board problems before ordering parts
Finding / confirmed status
The code identified a drain-pump/drain-lift abnormality path for the applicable CITY MULTI service literature, but the exact failed component still required model-specific physical testing.
Repair / action taken
Established the correct diagnostic path and part-identification requirements; final pump/hose replacement is model-dependent and should follow the exact indoor-unit parts/service documentation.
Final operating readings
- Diagnostic direction
- Drain pump / drain sensor / lift path
- Part selection
- Exact indoor-unit model required
Technician notes
Do not order a condensate pump from the controller code alone. Mitsubishi indoor-unit pump assemblies, hoses, sensors, and connectors vary by model.
- Record the complete model with the code
- Check the physical drain path before replacing the board
- Use the parts breakdown to identify pump and hose assemblies
Safety cautions
- De-energize the indoor unit before opening electrical or pump compartments
- Protect the occupied area from condensate when testing the drain system
Safety 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.