Kinghome Error Code P3: Compressor intermediate-frequency test display (Heat Pump)

Updated October 13, 2026 · by Aurora Star Tech Inc.

Kinghome error code P3 on a heat pump means: Compressor intermediate-frequency test display. It is also called Kinghome diagnostic code P3.

Low severityHeat PumpKinghome KM HT1DI · Kinghome KM HF1DI

Homeowner? What Kinghome code P3 means for you

Usually minor Your heat pump is reporting: Compressor intermediate-frequency test display. This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.

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) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Kinghome error code P3 mean?

Not a fault: shown during the middle-speed test.

Applies to: Kinghome KM09HT1DI, KM12HT1DI, KM18HT1DI, KM24HT1DI wall mini-splits; Kinghome KM09HF1DI to KM24HF1DI wall mini-splits (Gree GFH..DA/DB)

Common causes of Kinghome code P3

Test mode active

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Kinghome models that use code P3

KM09HF1DI KM09HT1DI KM12HF1DI KM12HT1DI KM18HF1DI KM18HT1DI KM21HF1DI KM24HF1DI KM24HT1DI

Other Kinghome Heat Pump codes

Code	Meaning
L9	Power limit protection
LC	Compressor start failure
LP	Indoor and outdoor unit mismatch
P0	Compressor minimum-frequency test / driver reset
P1	Compressor rated-frequency test display
P2	Compressor maximum-frequency test display
P5	Compressor phase overcurrent
P6	Main-to-driver communication error
P7	Module temperature sensor circuit fault
P8	Power module over-temperature
PA	AC current protection
Pc	Drive current detection error

All Kinghome Heat Pump error codes →

Kinghome code P3: homeowner questions

What does Kinghome code P3 mean?

Compressor intermediate-frequency test display. Not a fault: shown during the middle-speed test.

Is it safe to keep using my heat pump with code P3?

Usually yes. Code P3 is normally minor, but if it keeps coming back have it checked.

Can I reset Kinghome code P3 myself?

You can try one reset (power off for 30 seconds, then on). If Kinghome code P3 comes back, the cause is still there and a licensed technician should check it.

Who can fix Kinghome code P3 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. 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.