HVACopedia

Kinghome · Heat pump

EU Frequency reduced - module too hot

Low severity Kinghome KM HT1DIKinghome KM HF1DI

What the control is telling you

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)

Likely causes

  • Dry or missing thermal grease on the IPM
  • Loose heat sink

Test and repair steps

  1. Wait 20 min after de-energizing, then inspect the thermal grease on the IPM.
  2. Re-seat the heat sink firmly.
  3. Replace the outdoor board if it persists.

Models that show this code

9 models in Kinghome KM HT1DI, Kinghome KM HF1DI

KM09HF1DIKM09HT1DIKM12HF1DIKM12HT1DIKM18HF1DIKM18HT1DIKM21HF1DIKM24HF1DIKM24HT1DI

Other codes on the same units

  • U5 Whole-unit current detection fault
  • U7 Four-way valve abnormal
  • EE Memory chip fault
  • FH Frequency reduced - anti-freeze
  • HC PFC protection
  • LC Compressor start failure
  • LP Indoor and outdoor unit mismatch
  • PH DC bus voltage high

Save it for the next call

Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.

Open the app

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. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

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.