Kenmore Refrigerator Error Code Er dH: Defrost Heater Failure

What Er dH Means for Your Food

Your Kenmore refrigerator displays Er dH — indicating the defrost heating system has failed. This may not seem urgent because the refrigerator is likely still cold right now. However, Er dH is a progressive failure: without working defrost, ice accumulates on the evaporator coils over days to weeks, gradually blocking airflow until the refrigerator and freezer stop cooling effectively.

Timeline if not addressed:

• Days 1-7: Cooling seems normal but ice is building on evaporator behind the rear panel
• Days 7-14: Fresh food section may start warming slightly as airflow decreases
• Days 14-21: Freezer fan noise changes (blade contacts ice buildup), cooling degrades noticeably
• Week 3+: Refrigerator cannot maintain safe temperatures, food begins spoiling

You have time but should not delay. Address Er dH within the first week for best outcome.

Platform Identification

Er dH is an LG-platform code appearing on 795.xxxxx and 796.xxxxx Kenmore Elite refrigerators. These units are manufactured by LG.

If your model prefix is 106.xxxxx (Whirlpool-built), you would see defrost codes in a different format (like "dF" or error number sequences). 253.xxxxx (Frigidaire) uses different defrost error indicators.

This guide applies only to the LG-built 795/796 platform.

How the Defrost System Works

LG-built Kenmore Elite refrigerators use an automatic defrost cycle that runs approximately every 8-12 hours of compressor run time (typically once or twice per day). During defrost:

1. The compressor shuts off
2. The evaporator fan stops
3. A glass-tube defrost heater mounted beneath the evaporator coils energizes
4. The heater runs until the defrost termination thermostat (bi-metal switch on the evaporator) reaches approximately 47F, confirming all ice has melted
5. Melt water drains through a channel into a pan on the compressor (where it evaporates naturally)
6. The board resumes normal cooling

Er dH triggers when the main board commands the defrost cycle but the heater circuit reports no current flow — meaning the heater did not actually energize.

Root Causes

Cause 1: Defrost Heater Burned Out (50% of Cases)

The defrost heater is a resistive heating element (like a light bulb filament) inside a glass tube. After 6-10 years of twice-daily cycling, the element eventually burns through — creating an open circuit. This is normal wear-out.

Testing:

1. Unplug the refrigerator
2. Remove the back panel inside the freezer compartment (typically 4-6 screws plus clips). This exposes the evaporator coils and the heater assembly mounted below them.
3. Disconnect the heater's wire connector (two-pin plug)
4. Set multimeter to ohms. Measure across heater terminals.
   • Expected: 20-50 ohms (varies by model)
   • OL (open): heater element burned out — replace
   • Near zero: heater is shorted — replace

Replacement heater: LG part number varies by model (common: 5300JB1092A, 5300JB1092B). Cost: $30-$60. Installation: disconnect old heater from clips/brackets, install new one in same position, reconnect wires. 30-45 minutes including panel removal.

Cause 2: Defrost Termination Thermostat Stuck Open (25% of Cases)

The bi-metal thermostat mounted on the evaporator serves two purposes: it terminates the defrost cycle when ice is melted (opens at 47F to cut heater power), and it completes the heater circuit at cold temperatures (below 30F, the thermostat is closed, allowing current to flow to the heater).

If this thermostat's contacts have fused in the open position, the heater never receives power regardless of temperature — the circuit is permanently interrupted at the thermostat.

Testing:

1. With the evaporator panel removed and heater connector accessible
2. The thermostat is usually mounted to one of the evaporator tubes (looks like a small disc or cylinder with two wires)
3. At freezer temperature, the thermostat should be CLOSED (continuity between its terminals). If it reads OPEN at freezer temperature, it has failed.

Replacement: $10-$25 for the thermostat alone. Clips off the evaporator tube.

Cause 3: Wiring Break in Defrost Circuit (15% of Cases)

The wiring from the main board to the defrost heater passes through the rear wall of the freezer compartment. This transition from room-temperature rear to sub-zero freezer interior creates a thermal gradient that condenses moisture at the wall penetration. Over years, this moisture corrodes the wire terminals or causes ice to form around the wires — physically breaking them as ice expands.

Diagnosis: If the heater and thermostat both test good individually, test continuity of the circuit from the board connector through the wire run to the heater. An open in the wiring confirms a break in the harness.

Fix: Splice or replace the damaged section. Cost: $0-$20 in materials.

Cause 4: Main Board Defrost Relay Failure (10% of Cases)

The board's defrost relay (the switching component that routes power to the heater circuit during defrost) can fail open — never conducting. Heater and thermostat are both good, wiring is intact, but power never arrives.

Diagnosis: During a commanded defrost cycle (enter service mode to force defrost), measure voltage at the heater connector. Should see approximately 120VAC during defrost command. If 0V: board relay has failed.

Fix: Board replacement. Cost: $120-$250.

Entering LG Service Mode

For 795/796 Kenmore Elite refrigerators: Press and hold the Refrigerator and Freezer buttons simultaneously for about 5 seconds until the display enters service mode. From there, you can force a defrost cycle to test the heater circuit (consult model-specific tech sheet for exact button sequence on your model).

Emergency Defrost (Manual)

If ice has already built up significantly (you can hear the evaporator fan struggling or see frost through the air vents):

1. Remove all food from the freezer
2. Unplug the refrigerator
3. Leave the freezer door open
4. Place towels inside and around the base to catch melt water
5. Wait 8-12 hours for complete ice melt (do NOT use a heat gun or hair dryer on the evaporator — you can damage the aluminum fins)
6. Once clear, repair the defrost component and plug back in

This manual defrost buys you time while waiting for parts.

Cost Summary

Note on preventative replacement: Many technicians recommend replacing both the heater and thermostat together since both are exposed and both have similar lifespans. The incremental cost of adding the $10-$25 thermostat while the freezer is already open is trivial compared to a separate service call later.

Frequently Asked Questions

Can I keep using the refrigerator with Er dH? Yes, for a limited time. The refrigerator continues cooling normally until ice buildup restricts the evaporator airflow. You have roughly 1-3 weeks before cooling degrades significantly (shorter if the unit was already partially frosted when Er dH appeared).

How do I know if ice has already built up? Listen for the evaporator fan (inside the freezer). If it sounds strained, louder than usual, or makes intermittent buzzing/clicking sounds, ice is likely contacting the fan blade. Also check: is the freezer cold but the fresh food section warming? This pattern indicates blocked evaporator airflow.

Is Er dH dangerous? Not in an immediate safety sense. The concern is food spoilage from gradual temperature loss. There is no fire or electrical hazard from this failure.

How long does the defrost heater last after replacement? Typically 6-10 years. It is a wear item with a predictable lifespan determined by cycle count.

Er dH on your Kenmore Elite? Our technicians carry defrost heaters and thermostats for same-visit repair on LG-built Kenmore refrigerators. We also perform manual defrost during the visit if ice has already accumulated. Book your repair.