Kinghome Error Code Operation lamp: Operation lamp lit (power connected) (Heat Pump)

Updated October 16, 2026 · by Aurora Star Tech Inc.

Kinghome error code Operation lamp on a heat pump means: Operation lamp lit (power connected). It is also called Kinghome diagnostic code Operation lamp.

Low severityHeat PumpKinghome KM HT1DI · Kinghome KM HF1DI

Homeowner? What Kinghome code Operation lamp means for you

Usually minor Your heat pump is reporting: Operation lamp lit (power connected). 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 Operation lamp mean?

After power is connected the unit beeps and the indoor operation lamp lights (red on most units; the colour depends on the model). From then on the unit can be run from the remote or the panel. On the floor-ceiling panel the POWER lamp lights when power is on and goes out when power is removed.

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

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 Operation lamp

KM09HF1DI KM09HT1DI KM12HF1DI KM12HT1DI KM18HF1DI KM18HT1DI KM21HF1DI KM24HF1DI KM24HT1DI

Other Kinghome Heat Pump codes

Code	Meaning
L9	Power limit protection
LC	Compressor start failure
Lock icon	Remote keypad locked
LP	Indoor and outdoor unit mismatch
OF	Debug menu option OFF
ON	Debug menu option ON
P0	Compressor minimum-frequency test / driver reset
P1	Compressor rated-frequency test display
P2	Compressor maximum-frequency test display
P3	Compressor intermediate-frequency test display
P5	Compressor phase overcurrent
P6	Main-to-driver communication error

All Kinghome Heat Pump error codes →

Kinghome code Operation lamp: homeowner questions

What does Kinghome code Operation lamp mean?

Operation lamp lit (power connected). After power is connected the unit beeps and the indoor operation lamp lights (red on most units; the colour depends on the model). From then on the unit can be run from the remote or the panel. On the floor-ceiling panel the POWER lamp…

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

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

Can I reset Kinghome code Operation lamp myself?

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

Who can fix Kinghome code Operation lamp 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

Troubleshooting guides

2 flashes: HPS open ≥6 s; 3: discharge >263°F; 4: discharge <90°F after 1 h; 5: defrost failure; 6: discharge sensor short; 7: outdoor sensor open/short; 9: bonnet sensor fail All brands · Heat Pump
Excess ice on outdoor coil All brands · Heat Pump
Extremely high head pressure in heating (dual fuel) All brands · Heat Pump
Insufficient heat in cold weather All brands · Heat Pump
Liquid slugging / compressor damage in heating All brands · Heat Pump
No mode change / wrong mode All brands · Heat Pump
Odour at registers (dirty sock) All brands · Heat Pump
Poor heating but OK cooling (or vice-versa) All brands · Heat Pump
Service problem analysis (Amana chart excerpt) All brands · Heat Pump
Subcooling too high All brands · Heat Pump
Subcooling too low vs mfr target All brands · Heat Pump
TXV bulb/diaphragm failure All brands · Heat Pump
Water-source: coil freezing All brands · Heat Pump
Won't change mode / both coils same temperature All brands · Heat Pump
Wrong superheat after line-set change; poor capacity All brands · Heat Pump
Force a defrost cycle from the remote Kinghome · Heat Pump
Force a defrost from the outdoor board (debug item 06) Kinghome · Heat Pump
Force cooling or heating from the outdoor board (debug item 09) Kinghome · Heat Pump
Open the outdoor board debug menu (SW1 held 5 s) Kinghome · Heat Pump
Start refrigerant recovery from the outdoor board (debug item 08) Kinghome · Heat Pump
Start the pilot (test) run from the remote Kinghome · Heat Pump
Switch between defrosting mode 1 and 2 Kinghome · Heat Pump

Source: Kinghome KM09-12-18-24HT1DI service manual, sec. 6.1 remote controller notes; sec. 6.2 floor-ceiling panel lamps; Kinghome KM09-24HF1DI service manual, sec. 6.1 introduction of control panel. 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.