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Kinghome · Heat pump

E1 High pressure protection / high-pressure sensor fault

High severity Kinghome KM HT1DIKinghome KM HF1DIKinghome Ultranixx EcoKinghome Ultranixx

What the control is telling you

On the wall units E1 means the system tripped on excessive high-side pressure. On the Ultranixx outdoor units, E1 is the high-pressure protection trip, and lower-case e1 means the high-pressure sensor signal is out of range for 30 s. In protection mode the compressor stops.

Applies to: Kinghome KM09HT1DI, KM12HT1DI, KM18HT1DI, KM24HT1DI wall mini-splits; Kinghome KM09HF1DI to KM24HF1DI wall mini-splits (Gree GFH..DA/DB); Kinghome Ultranixx Eco KD24UHO to KD60UHO outdoor units with KD..UHI air handlers; Kinghome Ultranixx cold-climate KU36UHO and KU60UHO outdoor units with KU..UH2I and KD..UHI air handlers

Likely causes

  • Overcharge of refrigerant
  • Dirty coils or poor airflow, hot ambient
  • Closed service valve, blocked line, or blocked indoor filter or duct in heating
  • Outdoor or indoor fan not running correctly
  • Faulty high-pressure switch or pressure sensor, or loose sensor plug (e1)

Test and repair steps

  1. Clean filters and coils and clear any airflow obstruction.
  2. Verify both fans run at the right speed.
  3. Make sure the service valves are fully open and the lines are not restricted.
  4. Check the charge against the nameplate; recover refrigerant if overcharged.
  5. Test the high-pressure switch or sensor and its plug; replace if faulty.
  6. If all is normal, check the control board.

Models that show this code

27 models in Kinghome KM HT1DI, Kinghome KM HF1DI, Kinghome Ultranixx Eco, Kinghome Ultranixx

KD24UHIKD24UHOKD30UHIKD30UHOKD36UHIKD36UHOKD42UHIKD42UHOKD48UHIKD48UHOKD60UHIKD60UHOKM09HF1DIKM09HT1DIKM12HF1DIKM12HT1DIKM18HF1DIKM18HT1DIKM21HF1DIKM24HF1DIKM24HT1DIKU24UH2IKU36UH2IKU36UHOKU48UH2IKU60UH2IKU60UHO

Other codes on the same units

  • A1 Outdoor fan IPM module protection
  • C4 ODU jumper cap error
  • C5 Jumper cap missing or wrong
  • C8 ODU drive jumper cap error
  • E2 Indoor coil anti-freeze protection
  • E3 Low pressure protection / low-pressure sensor fault
  • E4 Compressor discharge temperature too high
  • E5 Overcurrent protection

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Source: Kinghome KM09-12-18-24HT1DI service manual, sec. 9.1 error code list; Kinghome KM09-24HF1DI service manual, sec. 11.1 error code list; Kinghome Ultranixx Eco KD24-60UHO service manual, sec. 3.3-3.4; Kinghome Ultranixx cold-climate KU36/60UHO service manual GC202306, sec. 3.3-3.4. 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.