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LG Dryer Error Code dH

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: June 10, 2026
⚠ High Severity 🔧🔧 Moderate DIY

High temperature error — drum temperature exceeded safe limit

The most common cause of the dH error on a LG dryer is severely blocked exhaust duct (~55% of cases); start with: clean vent system thoroughly.

💰 DIY cost: $8–$35 👨‍🔧 Pro cost: $150–$320 Save $142+ by doing it yourself
LG Dryer error code dH on the display panel
How the dH code appears on a LG dryer display

What Does Error Code dH Mean on a LG Dryer?

High temperature error — drum temperature exceeded safe limit.

The dH code fires when the control board reads drum or exhaust temperatures above the safe operating limit, typically via the thermistor working alongside the high-limit thermostat. Restricted airflow lets heat build up faster than it dissipates, tripping the safety threshold. Unlike the flow-check codes D90/D95 that flag restriction by monitoring dry time, dH reflects an actual measured overtemperature, and unlike a blown thermal fuse it usually still allows the drum to run until the fault registers.

Models affected: Most LG electric and gas dryers with electronic controls, including models such as DLEX3900W, DLE3500W, DLEX4500B, DLE7150W, and DLG3601W
What owners report: Owners commonly report dH appearing partway through a cycle, especially on heavy loads or after the vent hasn't been cleaned in a while. A false trigger can come from a crushed foil transition hose or a clogged exterior flap, so many find that a thorough vent cleaning clears it before any part replacement is needed.

What Causes Error Code dH?

Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:

  1. 1
    Severely blocked exhaust duct 55% of cases
  2. 2
    High-limit thermostat failure 25% of cases
  3. 3
    Heater stuck on (relay failure) 20% of cases

How to Fix LG Dryer Error Code dH

🔧🔧 Moderate DIY Est. time: 30–60 min
⚡ Safety first: Unplug the appliance before opening any panels or touching internal components.
  1. 1

    Clean vent system thoroughly

    Clean lint filter, full duct run, exterior cap.

    🔩 Dryer vent brush kit ($15–$35)
  2. 2

    Test high-limit thermostat

    Test for continuity after cleaning. Tripped thermostat = replace.

    🔩 LG high-limit thermostat ($10–$25)
  3. 3

    Test thermal fuse

    Blown fuse = no heat but motor runs.

    🔩 LG thermal fuse ($8–$20)

How to Reset Error Code dH

After clearing vent and replacing failed components, unplug 5 minutes before restarting.

Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.

Full LG dryer reset guide → Enter diagnostic mode → Symptom guide: Dryer not heating →

Did this guide fix your appliance?

When to Call a Professional

If vent is clear and thermostats are fine but overheating persists, heating element relay has stuck closed.

Average professional repair cost for this issue: $150–$320

Related Error Codes

D90
Duct blockage detected — exhaust duct 90% blocked
⚠ High Severity
D95
Duct blockage detected — exhaust duct 95% blocked
⚠ High Severity

Same Code on Other Brands

Error code dH appears on these other brands too. See every brand that shows dH →

Kenmore logo
Kenmore Refrigerator dH
Defrost heater fault — defrost did not complete

Find Replacement Parts

Use these links to find the exact replacement parts for your LG Dryer:

🔩
Search PartSelect
LG Dryer repair parts
🔧
Search RepairClinic
Step-by-step video guides

External links — ApplianceErrors.com is not affiliated with these retailers.

More LG Dryer Error Codes

D80 Duct blockage detected — exhaust duct 80% blocked F9 Thermistor failure — temperature sensor not reading CL Child lock is active — controls are locked nP No power to the heating element D75 Exhaust duct ~75% blocked — airflow restriction warning PS Power supply error — improper voltage at the cord or terminal block

Frequently Asked Questions

Can I keep using my LG Dryer when error dH appears? +
It is not advisable. The dryer may still power on, but running it while dH is active can worsen the heating fault or damage related parts. Treat it as a soon-as-possible repair.
What most commonly causes dH on a LG Dryer? +
Across reported LG dryer repairs, the most frequent is severely blocked exhaust duct (55% of cases), high-limit thermostat failure (25%), then heater stuck on (relay failure) (20%). Check them in that order before replacing any parts.
dH keeps coming back after a reset — what should I check next? +
A reset only clears the stored dH fault; if it returns, the heating problem is still present. Move on to the physical checks — clean vent system thoroughly, then test high-limit thermostat — since the code will reappear until the root cause is resolved. This is a moderate job — a multimeter and some disassembly are usually involved.
How much does it cost to fix LG Dryer error dH? +
A DIY repair typically runs $8–$35 in parts, versus $150–$320 for a professional service call, so handling it yourself saves around $142. Expect the work to take roughly 30–60 minutes.
Which LG Dryer models show error dH? +
dH is documented on Most LG electric and gas dryers with electronic controls, including models such as DLEX3900W, DLE3500W, DLEX4500B, DLE7150W, and DLG3601W. Other units sharing the same control platform can display it too, so the fixes here generally transfer across the series.

Sources & References

Content verified against manufacturer service documentation. Last verified: June 10, 2026.

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