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LG · Refrigerator (Top Freezer)

LG Refrigerator (Top Freezer) dH error code

Difficulty: Hard · Cost: $100–$300 · Duration: 2m

The dH error means your LG refrigerator attempted to run a defrost cycle but could not raise the evaporator temperature to the required level within one hour. This can appear in different variations depending on the model. The defrost system is responsible for melting frost that builds up on the evaporator coils — when it cannot complete this process the coils can ice over and reduce cooling efficiency. A reset sometimes clears a temporary fault but a recurring dH error usually points to a problem with the defrost heater, thermostat, or sensor that needs professional attention.

Common causes

  • Defrost heater has malfunctioned or failed and cannot generate enough heat
  • Defrost thermostat is faulty and not allowing the heater to activate
  • Defrost sensor is providing incorrect temperature readings
  • Excessive frost buildup on the evaporator coils blocking heat distribution
  • Temporary electronic glitch causing a false defrost timeout

How to fix it

  1. 1

    Unplug the refrigerator from the outlet and wait 2 minutes

  2. 2

    Plug it back in and allow the unit to run a fresh defrost cycle

  3. 3

    Monitor the unit to see if the dH error returns

  4. 4

    If dH keeps appearing after resetting contact a technician to inspect the defrost heater, thermostat, and sensor

Related LG Refrigerator (Top Freezer) error codes

1

OF F

Demo mode is active — all cooling has been disabled

easy
2

FS

The freezer temperature sensor has a short circuit or disconnection

hard
3

rS

The refrigerator temperature sensor has a short circuit or disconnection

hard
4

dS

The defrost sensor has a short circuit or disconnection

hard

dH error — frequently asked questions

What does the dH error mean on a LG refrigerator (top freezer)?

The defrost cycle took longer than one hour without reaching the target temperature

What causes the dH error?

The dH error is usually caused by: Defrost heater has malfunctioned or failed and cannot generate enough heat; Defrost thermostat is faulty and not allowing the heater to activate; Defrost sensor is providing incorrect temperature readings; Excessive frost buildup on the evaporator coils blocking heat distribution; Temporary electronic glitch causing a false defrost timeout.

Can I fix the dH error myself?

This is rated a hard fix — it often requires tools, parts, or experience, and may be safer left to a professional technician.

How much does it cost to fix the dH error?

Fixing the dH error on a LG refrigerator (top freezer) typically costs $100–$300, depending on parts and whether you do it yourself or hire a technician.

Is it safe to keep using my refrigerator (top freezer) with the dH error?

We'd recommend addressing the dH error before continuing to use the refrigerator (top freezer), since hard-rated issues often involve a real fault rather than a minor glitch.