Inverter Compressor Discharge Pipe High Temperature

What it means

This code appears on LG inverter split air conditioners and on LG ducted and cassette units that use CH codes. It means the sensor on the compressor discharge pipe recorded a temperature above the safe limit, so the unit stopped the compressor to protect it. The most common cause is low refrigerant or poor refrigerant flow. The same code can mean something else on other brands.

Models covered: LG inverter split air conditioners (e.g. Dual Inverter) and LG ducted/cassette units that use CH codes; the code shows as CH plus a number on the display or as LED blinks.

Related codes: CH38CH41CH61CH46CH29

Symptoms4

• The unit runs with weak cooling for a while, then CH32 shows and the compressor stops.
• The pipes at the outdoor unit are not as cold as usual.
• The fault repeats in the hottest hours.
• Partial frost may form on a pipe or on the outdoor unit service valves.

Possible causes5

• Low refrigerant from a leak at the joints, evaporator or condenser.
• Blocked or faulty electronic expansion valve, or a blocked strainer or capillary.
• Dirty condenser or weak outdoor fan in extreme heat.
• Crushed or kinked connecting pipes between the units.
• Discharge pipe sensor out of place or reading inaccurately.

How to diagnose5

1. Switch off the breaker and let the compressor cool for at least half an hour; clear around the outdoor unit.
2. A technician measures system pressures and pipe temperatures against LG specification to see whether the charge is low.
3. If the charge is low, find the leak with a leak detector or soap bubbles on joints and valves.
4. Check the electronic expansion valve and its coil, and look for kinked pipes.
5. Confirm the discharge sensor is fixed properly and measure its resistance against the LG table.

How to fix6

1. Wash the condenser and fix a weak outdoor fan.
2. Refit the discharge sensor, or replace it if its reading is wrong.
3. Repair the leak, then evacuate and recharge by weight (licensed technician only).
4. Replace the electronic expansion valve, its coil or a blocked strainer.
5. Repair kinked or crushed pipes.
6. Run the unit for a long period in the heat and confirm stable discharge temperature with no code.

Repair cost

In Saudi riyals; the highlighted part is the expected range for this fault.

The low end is a wash or sensor fix, the most common case is a leak repair with recharge, and the top covers an expansion valve or a hard-to-reach leak.

Prices are rough estimates including the part and the technician’s fee, and vary with brand, model and part source.
Prices last updated: September 2026

Frequently asked questions