LG Refrigerators error code
Defrost system did not warm as expected
The defrost sensor did not detect the expected temperature rise during the defrost cycle.
Also shown as: dHF, FdH
Direct answer
dH / FdH at a glance
- Meaning
- Defrost system did not warm as expected
- Urgency
- Service recommended
- First safe check
- Check for reduced cooling or heavy frost.
- Model note
- Confirm the code and access instructions in the manual for your exact model.
Likely causes
Why dH / FdH appears
- 01Ice is blocking the evaporator
- 02Defrost heater or thermal fuse fault
- 03Sensor, relay, or drain issue
Safe diagnostic path
What to check, in order
- 01
Check for reduced cooling or heavy frost.
- 02
Disconnect power for one minute and restore it once.
- 03
Arrange service if the code returns.
Know when to stop
Don’t push past this point
Move food to safe cold storage if temperatures rise. Internal defrost components require professional inspection.
Primary source
How this page was checked
The code meaning and manufacturer-specific guidance were checked against the linked support material on August 28, 2026. Confirm details against the manual for your exact model before removing panels or parts.
Read LG USA: refrigerator digital error codes ↗Common follow-up questions
About LG code dH / FdH
What does dH / FdH mean on a LG refrigerators?
dH / FdH means “Defrost system did not warm as expected.” The defrost sensor did not detect the expected temperature rise during the defrost cycle.
Can I clear dH / FdH by resetting the appliance?
A reset may clear a temporary alert, but it does not correct the underlying condition. Start with the safe checks above and stop if the code returns. Move food to safe cold storage if temperatures rise. Internal defrost components require professional inspection.
Does dH / FdH mean the same thing on every LG model?
Not necessarily. Display codes can vary by model and product family, so confirm the meaning and access instructions in the manual for your exact model before removing covers or parts.
When should I stop troubleshooting dH / FdH?
Move food to safe cold storage if temperatures rise. Internal defrost components require professional inspection.