LG Air Conditioner: intermittently turning off and on

Professional Repair Guide

What is this symptom?

Is your LG air conditioner intermittently turning off and on? This common issue, known as short cycling, can prevent your unit from reaching the desired temperature and disrupt your comfort. Typically caused by airflow restrictions, thermostat issues, or electrical faults, understanding the root of the problem is essential for effective resolution.

Urgency: Medium

Important Tips for LG Models

  • Official LG guidance specifically identifies loose power plug and outlet issues as causes for intermittent power cutoffs. (

Possible Causes

Short cycling due to airflow restriction

How to Identify: Weak airflow from vents; filter visibly dirty or clogged; unit runs only a few minutes before shutting off.

Part: Air filter / airflow system

Thermostat malfunction or placement issue

How to Identify: Thermostat displays incorrect temperature; placed in direct sunlight, near heat sources, or inconsistent readings.

Part: Thermostat / temperature sensor

Refrigerant level problems (leak or imbalance)

How to Identify: Hissing sounds near lines, warm air from vents, ice on coils, reduced cooling performance.

Part: Refrigerant system (lines, compressor)

Electrical/control component faults

How to Identify: Random cycling not correlated with temperature, clicking noises, tripped breakers, visual wiring issues.

Part: Control board / relays / wiring

Power supply issues

How to Identify: Air conditioner cuts off when other appliances start; breaker trips; power plug loose.

Part: Power outlet / circuit breaker

DIY Solutions

Clean or replace air filter

Easy 5-15 minutes
Tools Needed: none or soft brush
  1. Turn off and power down the air conditioner.
  2. Locate and remove the air filter.
  3. Clean the filter with water or replace it if heavily clogged.
  4. Reinstall the filter and restart the unit.
⚠️ Safety First: Turn off power before accessing filters.

Check thermostat placement and settings

Easy 10 minutes
Tools Needed: none
  1. Ensure the thermostat is placed away from direct sunlight and heat sources.
  2. Check thermostat temperature settings and mode (cool).
  3. Replace batteries if applicable.

Ensure secure power connection

Easy 5 minutes
Tools Needed: none
  1. Check that the air conditioner power plug is firmly inserted in an exclusive outlet.
  2. Avoid using power strips; connect directly to a wall outlet.
  3. Reset relevant circuit breakers if tripped.
⚠️ Safety First: Do not force plugs; consult electrician if outlet is damaged.

Next step

Choose the next step for intermittently turning off and on

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Check during diagnosis

Most relevant component to inspect

Appliance Air Filter

Captures dust and debris from the appliance's intake airflow.

Typical part-only price
$12 - $55
DIY difficulty
Easy
Estimated time
5-10 mins
Where can I find the model number?

Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.

Find a part that fits my model

Verify the complete model and part number on the retailer's compatibility page before ordering.

Other parts options

Check related components first; use model search as a fallback.

Possible related component

Temperature Sensor

Monitors the internal temperature to ensure correct operation and prevent overheating.

$15 - $35 · Easy · 15-30 mins

Check fit & price
Possible related component

Thermostat

Regulates temperature by turning the heating or cooling system on or off.

$15 - $40 · Easy · 15-30 mins

Check fit & price
Possible related component

Compressor

Compresses refrigerant within the sealed cooling system and requires specialized service equipment.

$180 - $600 · Hard · 120-240 mins

Check fit & price
Model number required

Model-compatible Air Conditioner parts

Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.

Find a part that fits my model

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.

Optional routine care

Maintenance supplies

These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.

Maintenance supply

Air Conditioner Fin Cleaner

For routine cleaning of accessible coil fins when permitted by the manufacturer. Disconnect power and follow product and appliance instructions.

View maintenance supply
Maintenance supply

Model-Compatible Washable AC Filter

A reusable filter option only where the appliance supports one. Match the full model, dimensions, and filter specification.

Compatibility check required: use the complete appliance model and compare the existing filter, bag, or specification before ordering.

Find one that fits my model

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.

Professional Repairs

Refrigerant leak detection and recharge

Estimated Cost: $150 - $500+

Electrical component diagnosis and repair

Estimated Cost: $200 - $800+

When to Call a Professional

Persistent short cycling after cleaning filters and checking thermostat.
Signs of refrigerant leak (ice build-up, hissing sounds).
Electrical issues like tripped breakers, burning smell, or visible wiring damage.
Unit runs for very short cycles (less than 5 minutes).

Preventive Maintenance

  • Replace or clean air filters: Airflow restriction causing short cycling
    Frequency: Every 1-3 months
  • Annual HVAC professional tune-up: Refrigerant issues, coil dirt buildup, electrical faults
    Frequency: Annually

Frequently Asked Questions

Why is my LG Air Conditioner intermittently turning off and on?
Common causes include airflow restrictions, thermostat issues, refrigerant problems, electrical faults, or power supply issues.
How do I fix LG Air Conditioner intermittently turning off and on myself?
Check and clean or replace the air filter, verify thermostat placement and settings, and ensure a secure power connection.
How much does it cost to fix intermittently turning off and on?
Professional repairs can range from $150 to $800+, depending on issues like refrigerant recharge or electrical component repairs.
When should I call a technician for intermittently turning off and on?
If DIY solutions do not resolve the issue, or if you suspect refrigerant or electrical problems, contact a technician.

References & Sources

Community Analytical Insights

Guidance from available sources; statistical claims are shown only for samples of at least 10 discussions

Common Issues Reported by Users

  • Thermostat malfunction or incorrect settings
  • Dirty air filter restricting airflow
  • Refrigerant leak causing temperature fluctuations

User Suggested Solutions

  1. Check and recalibrate the thermostat settings. Ensure it is set to the desired temperature and not in 'fan only' mode. If malfunctioning, replace the thermostat.

  2. Inspect and replace the air filter if dirty. Clean or replace it every 1-3 months to ensure proper airflow.

  3. Check for refrigerant leaks. If you suspect a leak, contact a professional to handle refrigerant recharge and repair.

Limited-source guidance; percentages and success-rate claims are not shown
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

  1. Air con turning itself off/on intermittently.

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