Lg Air Conditioner Error 45

⚡ Quick Answer: The LG air conditioner error code 45 indicates a potential drain pump failure, often accompanied by unusual noises and water accumulation around the u... ✅ DIY Fixable

What Does Error 45 Mean?

The LG air conditioner error code 45 indicates a potential drain pump failure, often accompanied by unusual noises and water accumulation around the unit. This error may also arise from communication faults with accessory modules or sensor issues related to temperature readings. Immediate attention is needed if the error persists or frequently recurs during operation.

Common Symptoms:

  • unit displays error code 45 or CH45 on the display
  • system operation may stop or be restricted

Possible Causes

  • Communication fault with optional accessory modules (low)
  • Sensor fault (variously reported as outdoor oil temperature sensor or capacitor temperature sensor) (low)

How to Fix Error 45

DIY Fix Basic checks and reset

  1. Turn off the air conditioner and disconnect from power
  2. Wait several minutes and reconnect power to perform a reset
  3. Observe if error returns

Technician Only Inspect accessory communications and sensor circuits

  1. Check communication lines between indoor unit and optional modules for continuity or faults
  2. Test relevant temperature sensors (outdoor oil or capacitor temp) for correct resistance and signal
  3. Repair or replace identified faulty modules or wiring

Parts needed: communication cables, optional accessory modules, temperature sensors

🛑 When to Call a Pro:
  • If error persists after basic reset
  • If error recurs frequently during operation
  • If you are unfamiliar with electrical diagnostics

Technical Specifications

wattage 50W
component Drain Pump
resistance 5-15 ohms
part_number LG 4681A20001A
voltage_rating 115V AC

Common Questions

What does 45 error mean on lg air conditioner?

Error 45 indicates a drain pump failure, unusual noises, and possible water accumulation.

Can I fix lg air conditioner 45 error myself?

Yes, try resetting the unit by disconnecting it from power and reconnecting after a few minutes.

How much does it cost to fix 45 error?

Repair costs range from ¥5,000 to ¥30,000, depending on parts and region.

When should I call a technician for 45?

Call a technician if the error persists after a reset or if you are not familiar with electrical diagnostics.

Data last verified: 2026-01-11

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