LG Dryer Error Code SYMPTOM‑NOT‑HEATING — How to Fix (Dryer Not Heating)
Fix LG Dryer SYMPTOM‑NOT‑HEATING with our step‑by‑step guide. Includes tools, parts, cost estimate, warranty info, and maintenance tips.
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What Does Error Code SYMPTOM‑NOT‑HEATING Mean?
Error SYMPTOM‑NOT‑HEATING on your LG Dryer means: The SYMPTOM‑NOT‑HEATING code appears when the dryer runs but does not produce hot air. It means the heating circuit—electric element, gas valve, or a safety device—has lost continuity, so the dryer stops heating to prevent a fire.
What You'll Need
🔧 Tools
- Phillips #2 screwdriver
- T20 Torx bit
- Digital multimeter (continuity/ohms mode)
- 7 mm and 8 mm nut driver set
- Shop‑vac with hose attachment
- Flexible vent brush (optional)
🛒 Parts
- Heating element (electric models) or gas valve assembly (gas models)
- Thermal fuse
- High‑limit thermostat
How to Fix Error SYMPTOM‑NOT‑HEATING — Step by Step
- 1
Power‑Cycle the Dryer
Turn off the dryer at the circuit breaker, wait 2 minutes, then turn the breaker back on. Plug the dryer back in, start a short timed cycle, and watch for the SYMPTOM‑NOT‑HEATING code. If it disappears, the problem was a transient glitch.
- 2
Inspect and Clean the Exhaust Vent
Detach the vent hose from the dryer’s rear. Use a shop‑vac and a flexible brush to clear lint from the hose, the dryer’s vent opening, and the exterior vent cap. Re‑attach the hose, making sure it isn’t kinked.
- 3
Test the Thermal Fuse
Locate the thermal fuse on the blower housing (usually a small rectangular part with two wires). Disconnect the wires, set the multimeter to continuity, and touch the probes to the fuse terminals. A good fuse will beep (≈0 Ω). If the meter shows infinite resistance, replace the fuse.
- 4
Check the High‑Limit Thermostat
The thermostat sits near the heating element. Disconnect its two wires, then measure continuity. At room temperature the thermostat should conduct (≈0 Ω). An open reading means the thermostat is faulty and must be swapped.
- 5
Verify Heating Element Continuity (Electric Dryers)
Remove the rear panel to expose the heating element coils. Disconnect the element’s connector, then place multimeter probes on the element terminals. A healthy element reads low resistance (typically 15‑30 Ω). An open circuit (∞ Ω) indicates a broken coil that needs replacement.
- 6
Inspect the Gas Valve Assembly (Gas Dryers)
With the dryer unplugged, locate the gas valve behind the control panel. Disconnect the electrical connector and measure the solenoid coil resistance (≈300‑500 Ω). No continuity means the coil has failed; replace the valve. Also confirm that the gas supply line is open and that the igniter glows during a cycle.
- 7
Reassemble and Run a Test Cycle
Reconnect all wires, secure the panels with the Phillips #2 screwdriver, and restore power. Select a timed cycle on high heat. Warm air should flow within a few minutes. If the SYMPTOM‑NOT‑HEATING code returns, the control board may be at fault.
When to Call a Professional
Call a licensed technician if you smell gas, detect a leak, the dryer still shows the error after replacing the heating element and safety devices, or if the control board shows burnt traces. Also, if the drum does not turn after you’ve verified all heating components, the motor or main board likely needs expert attention.
Field note: SYMPTOM‑NOT‑HEATING is too much heat / not enough airflow until the vent is proven clear. On LG dryers, clean the lint path through the wall cap so you can feel strong exhaust outdoors. Crushed foil hose and a bird nest beat a new heating element. Replace a thermal fuse only after airflow is fixed or it will open again.
What this code is not
- Not a ‘new heating element first’ code.
- Not a Wi-Fi or child-lock issue.
- A new fuse with a still-clogged vent will open again, often on the next load.
The LG Dryer error SYMPTOM-NOT-HEATING can be frustrating, especially when you’re in the middle of a laundry cycle. This error code indicates that your dryer is running but not producing hot air, which can be caused by a variety of factors. In this comprehensive guide, we’ll walk you through the possible causes, troubleshooting steps, and repair options to get your dryer heating again.
Initial Diagnostic Steps (Before Calling Anyone)
Before calling a professional or investing in repairs, perform these quick checks:
- Power cycle: Turn off the dryer at the circuit breaker, wait 2 minutes, and turn it back on. This simple reset can sometimes resolve the issue.
- Inspect the exhaust vent: Detach the vent hose from the dryer’s rear and use a shop-vac to clean out any debris or lint accumulation. A clogged vent can cause heating issues.
- Check for blockages: Ensure the dryer’s venting system is not blocked or kinked, which can restrict airflow and cause heating problems.
What Triggers This Error Code
Here are the possible causes of the SYMPTOM-NOT-HEATING error code, ranked by likelihood:
1. Faulty Thermal Fuse
- Description: The thermal fuse is a safety device that blows if the dryer overheats. A faulty thermal fuse can prevent the heating circuit from functioning.
- Verification: Use a multimeter to test the thermal fuse for continuity. If it shows no continuity, it’s likely faulty.
- Fix difficulty: Easy to moderate
- Cost: $10-$20
2. High-Limit Thermostat Issue
- Description: The high-limit thermostat monitors the dryer’s temperature and shuts off the heating element if it exceeds a certain threshold. A faulty thermostat can prevent the heating circuit from functioning.
- Verification: Test the thermostat for continuity using a multimeter. If it shows no continuity, it’s likely faulty.
- Fix difficulty: Moderate
- Cost: $20-$50
3. Heating Element Failure (Electric Dryers)
- Description: The heating element is responsible for producing heat in electric dryers. A faulty heating element can prevent the dryer from heating.
- Verification: Remove the rear panel and use a multimeter to test the heating element for continuity. If it shows no continuity, it’s likely faulty.
- Fix difficulty: Moderate to challenging
- Cost: $50-$100
4. Gas Valve Assembly Issue (Gas Dryers)
- Description: The gas valve assembly controls the gas flow to the burner. A faulty gas valve assembly can prevent the dryer from heating.
- Verification: Inspect the gas valve assembly for any blockages or damage. Use a multimeter to test the valve for continuity.
- Fix difficulty: Challenging
- Cost: $100-$200
Variations Across Product Lines
While the SYMPTOM-NOT-HEATING error code is common across many LG dryer models, some models may have variations in their heating circuits or safety devices. Here are some model-specific differences:
- LG Electric Dryer models (2015 and later): These models have a redesigned heating element that’s more prone to failure. Replacing the heating element may require additional steps.
- LG Gas Dryer models (2018 and later): These models have an updated gas valve assembly that’s more complex to repair.
Price Range for This Repair
Here’s a detailed breakdown of the repair costs:
| Repair Option | DIY Cost | Parts Cost | Professional Labor |
|---|---|---|---|
| Thermal fuse replacement | $10-$20 | $10-$20 | $100-$200 |
| High-limit thermostat replacement | $20-$50 | $20-$50 | $150-$300 |
| Heating element replacement (electric dryers) | $50-$100 | $50-$100 | $200-$400 |
| Gas valve assembly replacement (gas dryers) | $100-$200 | $100-$200 | $300-$500 |
Proactive Maintenance Checklist
To prevent the SYMPTOM-NOT-HEATING error code from recurring:
- Regularly clean the exhaust vent: Use a shop-vac and flexible vent brush to remove lint and debris.
- Check and replace worn-out parts: Inspect the thermal fuse, high-limit thermostat, and heating element regularly. Replace them if necessary.
- Run a cleaning cycle: Run a cleaning cycle every 1-2 months to remove lint and debris.
Red Flags That Mean Call a Repair Service
If you’re not comfortable with DIY repairs or if the issue persists after trying the troubleshooting steps:
- Call a professional: Contact an authorized LG service provider or a reputable appliance repair technician.
- What to expect: The technician will diagnose the issue, provide a detailed estimate, and perform the repair.
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