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Error code reference

LG Hvac Error Code 32

Inverter compressor discharge pipe temperature 105°C/220°F or higher.

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Inverter compressor discharge pipe temperature 105°C/220°F or higher.

First step from the service manual

Verify proper refrigerant charge & ensure unit is not in high-head temperature situation. Generally undercharge. Check discharge pipe thermistor: 244,000Ω at 20°C/68°F, 24,400Ω at 90°C/194°F.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Step-by-step tests with expected resistance, voltage, and continuity values
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What 32 means on a LG hvac

Error code 32 on an LG HVAC system indicates that the inverter compressor discharge pipe temperature has reached or exceeded 105°C (220°F). The discharge pipe thermistor monitors the temperature of the refrigerant gas leaving the compressor. Under normal operating conditions, discharge temperatures stay well below this threshold. When temperatures climb this high, it signals that the compressor is working under extreme stress, and the system triggers a protective shutdown to prevent compressor damage.

The most frequent root cause of this fault is an undercharged refrigerant system. When refrigerant levels are low, the compressor has to work harder to move an insufficient mass of refrigerant, causing discharge temperatures to spike. High-head pressure situations, such as a blocked condenser coil, inadequate airflow across the outdoor unit, or ambient temperatures that exceed the system's design limits, can also drive discharge temperatures above the fault threshold.

Diagnosing this fault begins with confirming proper refrigerant charge and ruling out any high-head pressure condition. The discharge pipe thermistor itself should also be tested for accuracy. The correct resistance values for this thermistor are 244,000 ohms at 20°C (68°F) and 24,400 ohms at 90°C (194°F). A thermistor reading significantly outside these values at a known temperature indicates a faulty sensor that could be triggering a false fault, though a genuine high-temperature condition is far more common.

Source: manufacturer service documentation.

Common causes of 32

  1. 01

    Low refrigerant charge

    Wiring / connection

    An undercharged system forces the compressor to work harder with insufficient refrigerant mass, causing discharge temperatures to rise sharply. Confirm refrigerant charge using manifold gauges and compare suction and discharge pressures against expected values for the operating conditions.

  2. 02

    Blocked or dirty condenser coil

    Wiring / connection

    A condenser coil clogged with dirt, debris, or biological growth restricts heat rejection, causing head pressure and discharge temperatures to climb. Inspect the outdoor unit coil and clean it thoroughly if airflow appears restricted.

  3. 03

    Restricted airflow at outdoor unit

    Part replacement

    Obstructions near the outdoor unit, a failed condenser fan motor, or a damaged fan blade can limit airflow and drive discharge temperatures above the fault threshold. Verify the fan is spinning freely at the correct speed and that no physical obstructions block the unit.

  4. 04

    Faulty discharge pipe thermistor

    Part replacement

    If the thermistor has drifted out of calibration or has failed, it may report falsely elevated temperatures. Test the thermistor resistance at a known temperature: the correct values are 244,000 ohms at 20°C (68°F) and 24,400 ohms at 90°C (194°F). A reading significantly outside these values points to a defective sensor.

  5. 05

    Refrigerant restriction in the system

    Part replacement

    A partial blockage in a filter drier, expansion valve, or refrigerant line can cause abnormally high discharge pressure and temperature even when the total refrigerant charge is correct. Check for unusual temperature differentials across components in the refrigerant circuit to locate a restriction.

See the test procedure for each cause

Frequently asked questions about 32

What does 32 mean on a LG hvac?
Error code 32 means the inverter compressor discharge pipe temperature has reached or exceeded 105°C (220°F), which is the system's protective shutdown threshold. The discharge pipe carries hot, high-pressure refrigerant gas away from the compressor, and temperatures this high indicate the compressor is under severe stress. The most common cause is a low refrigerant charge, though high-head pressure conditions can also trigger this fault. The system shuts down automatically to prevent compressor damage.
Can I fix LG error code 32 myself?
Some preliminary checks are safe for a homeowner, such as clearing debris from around the outdoor unit and ensuring the condenser coil is clean and airflow is unobstructed. However, checking and correcting refrigerant charge requires EPA Section 608 certification and proper equipment, so that portion of the repair must be performed by a licensed HVAC technician. Testing the discharge pipe thermistor with a multimeter is within reach for a knowledgeable DIYer if the system is safely powered down.
Is it safe to keep running my LG unit when error code 32 appears?
No, you should not continue operating the unit while this fault is active. The system shuts down automatically to protect the compressor, and attempting to override or repeatedly restart it without resolving the underlying cause risks permanent compressor failure. A damaged compressor is one of the most expensive repairs in an HVAC system, so addressing the fault promptly is strongly recommended.
How much does it cost to repair LG error code 32?
Repair costs vary widely depending on the cause. A refrigerant recharge by a technician typically ranges from $150 to $400 depending on refrigerant type and the amount needed. Replacing the discharge pipe thermistor is generally a lower-cost repair, often in the $100 to $250 range including labor. If the compressor has already sustained damage from operating at high temperatures, replacement costs can range from $800 to $2,500 or more depending on the unit.
Will resetting the LG unit clear error code 32?
Resetting the unit may temporarily clear the fault and allow the system to restart, but the error will return if the underlying cause has not been corrected. If the discharge temperature rises above 105°C (220°F) again, the system will shut down again. Repeatedly resetting without addressing the root cause, particularly a low refrigerant charge, increases the risk of compressor damage. A proper repair should be completed before returning the unit to regular operation.

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