What dH, FdH, dHF (Freezer Defrost Fault) Means
LG documents this as a defrost-cycle failure: the freezer or refrigerator compartment didn't reach the expected post-defrost temperature within the time the control board allows (LG's dedicated F dH/r dH article gives 1 hour on the main list and, on the digital-code page, 80 minutes without a 5-degree-Celsius rise - the two LG documents give slightly different numbers, which is why this entry hedges the exact window rather than picking one). The underlying cause LG names consistently is ice accumulation, a blocked drain hole, a blown thermal fuse, a failed defrost heater, or a main board fault.
Common Causes of dH, FdH, dHF (Freezer Defrost Fault)
- Ice buildup blocking the drain hole or evaporator
- Defrost heater or thermal fuse has failed
- Main control board (PCB) fault
- Door left open or not sealing, letting humid air in continuously
🔧 One Safe Check You Can Try
Move food to a cooler or spare fridge first, then unplug the refrigerator and leave both doors wide open - LG says to expect about a day in summer and up to three days in winter for the ice to fully melt - and only plug it back in once the ice is gone and you've dried out any standing water.
⚠ Why You Shouldn't Go Further Than That
- A repeat dH/FdH/dHF code after a full manual defrost points to a failed heater, thermal fuse, or board - parts that require disassembling the freezer's rear panel and aren't safely accessible with the unit plugged in.
- If you're worried about the food inside during the days-long defrost, that's exactly the situation LG says to have a technician evaluate instead of guessing at a fix.
- Repeated defrost failures that go unrepaired let ice keep building against the evaporator, which can eventually restrict airflow enough to stop cooling altogether.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.