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Pressure, discharge temperature and fan protections

Ultranixx

What happens, in order

  1. High pressure switch open for a short time: system shuts down and shows E1; first occurrence restarts once the switch recloses
  2. Second high-pressure trip within the set period: no automatic restart; switch the unit off, clear the cause and restart
  3. Low pressure switch open for a short time: shuts down and shows E3; restarts if the switch recloses within a few minutes; repeated trips block auto restart until switched off
  4. Discharge temperature sensor open for a short time: shuts down and shows E4; restarts if it recloses within a few minutes; repeated trips block auto restart
  5. Heating high-temperature prevention when the indoor coil sensor reaches a set value, the outdoor fan slows
  6. Overload (H4) is raised when condensing pressure exceeds the protection value

Codes you may see during this

E1 E3 E4 H4

Applies to: Kinghome Ultranixx ducted heat pump condensing units with air handlers

Models

KD24UHO-KD60UHOKU36UHO-KU60UHO

More Kinghome heat pump sequences

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Source: Kinghome Ultranixx Eco KD24-60UHO outdoor + KD..UHI air handlers service manual, 2.1-2.3 Operation mode and control; Kinghome Ultranixx cold-climate ducted heat pump KU36UHO-KU60UHO service manual GC202306, 2.1-2.3. Written in our own words; timings can differ by model and software version, so check the manual for your exact unit.

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.