LG air conditioner CH61 code: unit overheating (mini-split)

On LG mini-splits, CH61 is an overheat protection code. In cooling, the outdoor unit's coil is too hot, usually from poor airflow or a dirty coil. In heating, the indoor unit is too hot, usually from a clogged indoor filter.

Likely causes

Listed from most to least common.

1. Plants, fences, boxes or other objects blocking airflow around the outdoor unit
2. Outdoor coil clogged with dust, leaves or cottonwood
3. Outdoor unit in direct sun, an enclosed space or very hot air (LG gives about 118°F as an upper limit)
4. Indoor filter clogged, in heating mode
5. Outdoor fan or sensor fault

How to fix the CH61 code

Unplug the air conditioner or switch it off at the breaker before removing any panel or filter.

1. 1

   Step 1: Clear around the outdoor unit

   Move anything blocking the sides, back and top of the outdoor unit. If it sits on an enclosed porch or balcony, open windows or vents so hot air can escape.

2. 2

   Step 2: Clean the outdoor coil

   Turn off power to the outdoor unit at the breaker or disconnect. Wearing gloves, brush dust off the fins from top to bottom with a soft brush, or rinse with a garden hose from the top down. Do not use a pressure washer or bend the fins.

3. 3

   Step 3: Clean the indoor filters

   Lift the front panel of the indoor unit, slide out the filters and rinse them in lukewarm water. Let them dry fully before putting them back.

4. 4

   Step 4: Add shade if needed

   If the outdoor unit sits in strong afternoon sun, a securely fixed shade above it helps. Do not cover the back or sides.

5. 5

   Step 5: Reset the power

   Cleaning does not clear the code by itself. Switch off the breaker for 3 minutes, then turn it back on.

You'll need: Soft brush, garden hose, work gloves.

Parts that may need replacing

Check your model number on the label inside the door or on the back before ordering.

• Fin comb for AC coilsCheck prices
• Coil cleaner (no-rinse)Check prices

When to call a technician

If CH61 returns after the coil, filters and surroundings are clean, have a licensed HVAC technician check the outdoor fan, sensors and refrigerant charge.

A typical repair for this code costs $100–$450 in the US, including parts and labor. Prices vary by area and model.

Models this applies to

• Ductless mini-splits (wall-mounted and Art Cool)
• Multi-zone mini-split systems
• Window air conditioners
• Portable air conditioners

Codes can differ slightly between models. Your owner's manual is the final word and is available from LG support.

Common questions