Control panel shows "Er dH"
The “er dh” code
means a problem with the defrost cycle. It is triggered when the defrost sensor
does not reach 46 degrees F within 2 hours of the defrost cycle starting. If
indeed the defroster is not working, the evaporator (in the bottom of the
fridge in the freezer compartment and behind a plastic cover) will eventually
ice up completely, blocking the flow of cold air to the upper compartment. Use
a thermometer to check the upper compartment to verify that no or little cool
air is reaching it. If the evaporator is
iced up, the defrost cycle is not working. Quick fix to restore operation to
the upper compartment: tape over all vent holes in the upper section to keep
that cool while you work below. There are about 6-7 vent opens in the back wall
and two large one on the floor of upper compartment. Remove freezer door,
drawers, slide rails and pull back the plastic cover (2 screws hold it in
place, one in the center and one behind the ice maker) at the rear of the
freezer section to expose the evaporator. Spray hot water on the ice
accumulation on the evaporator (it looks like a radiator) to melt it
(remembering to sop up what flows to the drain pan at the rear). The entire
operation can be done in about 30 minutes (most time is used for removing ice
and sopping up water from the drain pan). All should be ok for 3-4 days
depending on humidity before the evaporator ices up again. In the meantime, order a replacement control
board. You can view this by removing a panel w/ 3 screws at the rear left of
the refrigerator. This panel controls all refrigerator functions, including
defrost. Most likely, the integrated relay for the defrost cycle failed.
Swapping out panels is a 10 minute job. Panels cost about $116 incl shipping
from repairclinc.com. Shipping is about a week. You can find a free service manual on line
that will help to identify all parts and is particularly useful for removing
doors and trays so you can get at the evaporator. All in all, the customer service is useless.
The fridge however is very easy to work on and amazingly simple. The
replacement board has a slightly different relay for the defrost heater, so LG
may have realized a problem existed with the original. It is also possible that
electrical surges damaged the relay. In
any case, 10 minutes and $116 seems pretty minor to have the fridge back to new
condition. Good luck.
Jan 22, 2009 |
LG LFX25960ST Stainless Steel French Door...