Kinghome Error Code EU: Frequency reduced – module too hot (Heat Pump)

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

Kinghome error code EU on a heat pump means: Frequency reduced - module too hot. It is also called Kinghome diagnostic code EU.

Low severityHeat PumpKinghome KM HT1DI · Kinghome KM HF1DI

Homeowner? What Kinghome code EU means for you

Usually minor Your heat pump is reporting: Frequency reduced - module too hot. 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 EU mean?

The compressor speed is being limited because the power module is hot.

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 EU

Dry or missing thermal grease on the IPM
Loose heat sink

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 EU

KM09HF1DI KM09HT1DI KM12HF1DI KM12HT1DI KM18HF1DI KM18HT1DI KM21HF1DI KM24HF1DI KM24HT1DI

Other Kinghome Heat Pump codes

Code	Meaning
E4	Compressor discharge temperature too high
E5	Overcurrent protection
E6	Indoor/outdoor communication fault
E8	High temperature resistance (overload) protection
E9	Water overflow protection
EE	Memory chip fault
F0	Refrigerant recovery mode
F1	Indoor room temperature sensor fault
F2	Sensor fault (indoor coil or outdoor condenser)
F3	Outdoor ambient temperature sensor fault
F4	Sensor fault (outdoor condenser or discharge)
F5	Outdoor discharge temperature sensor fault

All Kinghome Heat Pump error codes →

Kinghome code EU: homeowner questions

What does Kinghome code EU mean?

Frequency reduced - module too hot. The compressor speed is being limited because the power module is hot.

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

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

Can I reset Kinghome code EU myself?

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

Who can fix Kinghome code EU 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.