HVACopediaKinghome · Heat pump
E9 Water overflow protection
What the control is telling you
The drain-pan float detected a full pan for 8 s; the unit stops and the wired controller alarms.
Applies to: Kinghome KM09HT1DI, KM12HT1DI, KM18HT1DI, KM24HT1DI wall mini-splits
Likely causes
- Blocked condensate drain
- Drain pump fault
- Faulty float switch
Test and repair steps
- Clear the drain line.
- Check the drain pump operates.
- Test the float switch wiring.
- Restart after the pan empties.
Models that show this code
4 models in Kinghome KM HT1DI
Other codes on the same units
- E4 Compressor discharge temperature too high
- E5 Overcurrent protection
- E6 Indoor/outdoor communication fault
- E8 High temperature resistance (overload) protection
- F0 Refrigerant recovery mode
- F1 Indoor room temperature sensor fault
- F2 Sensor fault (indoor coil or outdoor condenser)
- F3 Outdoor ambient temperature sensor fault
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Source: Kinghome KM09-12-18-24HT1DI service manual, sec. 9.1 error code list. Summarized in our own words; check the original manual for your model.
Homeowner looking at this code? See what it means for you and when to call a technician.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.