Kinghome Error Code E4: Compressor discharge temperature too high (Heat Pump)
Kinghome error code E4 on a heat pump means: Compressor discharge temperature too high. It is also called Kinghome diagnostic code E4.
Homeowner? What Kinghome code E4 means for you
Call a technician Your heat pump is reporting: Compressor discharge temperature too high. The heat pump has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.
Safe things you can check yourself
- Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
- Check both breakers and the outdoor disconnect box beside the outdoor unit; all should be ON.
- Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
- In winter, keep snow and ice off and away from the outdoor unit. A short defrost cycle with steam is normal.
- Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Kinghome error code E4 mean?
The compressor discharge temperature exceeded its limit. The Ultranixx units trip at 115 C. The outdoor unit stops to protect the compressor.
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
Common causes of Kinghome code E4
- Low refrigerant charge
- Blocked system or closed service valve
- Faulty expansion valve (Ultranixx)
A technician checks these and 2 other possible causes on site before replacing any part.
Kinghome models that use code E4
Show all 27 models
KD24UHIKD24UHOKD30UHIKD30UHOKD36UHIKD36UHOKD42UHIKD42UHOKD48UHIKD48UHOKD60UHIKD60UHOKM09HF1DIKM09HT1DIKM12HF1DIKM12HT1DIKM18HF1DIKM18HT1DIKM21HF1DIKM24HF1DIKM24HT1DIKU24UH2IKU36UH2IKU36UHOKU48UH2IKU60UH2IKU60UHO
Other Kinghome Heat Pump codes
All Kinghome Heat Pump error codes →
Kinghome code E4: homeowner questions
What does Kinghome code E4 mean?
Compressor discharge temperature too high. The compressor discharge temperature exceeded its limit. The Ultranixx units trip at 115 C. The outdoor unit stops to protect the compressor.
Is it safe to keep using my heat pump with code E4?
It depends on the cause. The heat pump has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.
Can I reset Kinghome code E4 myself?
You can try one reset (power off for 30 seconds, then on). If Kinghome code E4 comes back, the cause is still there and a licensed technician should check it.
Who can fix Kinghome code E4 near me?
Aurora Star Tech Inc. repairs Kinghome heat pumps in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: AC Running But Not Cooling: What to Check · Heat Pump Not Heating or Blowing Cold Air
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. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.