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Error code reference

LG Heat Pump Error Code E441

Outdoor unit SUMP DOWN 1 protection control (SUMP temperature maintains over 95°C for 5 minutes).

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What the E441 error code actually means

Your LG heat pump detected that a critical area near the compressor got too hot and stayed that way for too long, so the system shut down to protect itself from serious damage. This is the unit's built-in safety system doing its job, but the underlying problem needs to be diagnosed and repaired before the system can safely run again. A qualified technician will need to inspect the compressor, a valve that controls refrigerant flow, and a temperature sensor to find the root cause.

Diagnostic procedure

The full E441 procedure

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1
First diagnostic step
Check digital compressor loading/unloading; check PWM valve; check temperature sensor attachment.
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Most common causes of E441

Ranked by how often they cause this code
  1. 1Digital compressor loading or unloading failure
  2. 2Faulty or stuck PWM valve
  3. 3Poor temperature sensor attachment
  4. 4Defective or failed temperature sensor
  5. 5Low refrigerant charge or refrigerant flow restriction

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Questions people ask about E441

What does E441 mean on a LG heat_pump?
E441 indicates an outdoor unit sump protection fault. The control board detected that the compressor sump temperature exceeded 95°C and remained above that threshold for 5 continuous minutes. The system enters protection mode automatically to prevent compressor damage. The fault points to issues with compressor loading, the PWM valve, or the sump temperature sensor.
Is it safe to keep using the heat pump while E441 is active?
No. E441 is a protective shutdown that indicates the compressor sump has been running at a dangerously high temperature. Continuing to operate the system in this condition risks permanent compressor failure. The unit should remain off until a technician inspects and resolves the fault.
What does a technician check to diagnose E441?
The first diagnostic steps involve verifying that the digital compressor is loading and unloading correctly, checking that the PWM valve is operating as commanded, and confirming that the sump temperature sensor is firmly attached and reading accurately. The technician will also check refrigerant pressures and system charge levels, since a low charge condition can contribute to elevated compressor temperatures.
Can I reset E441 myself to get the heat pump running again?
A power reset may clear the fault code temporarily, but E441 is a thermal protection event triggered by a sustained overtemperature condition. If the underlying cause is not corrected, the fault will return and the compressor may suffer damage over time. Resetting without diagnosing and repairing the root cause is not recommended.
How much does it cost to repair an E441 fault on an LG heat pump?
Repair costs depend heavily on which component is at fault. Sensor reattachment or replacement is typically the least expensive fix, often in the range of $75 to $200 including labor. A PWM valve replacement may run $150 to $400. Compressor-related repairs or replacement can range from $800 to $2,500 or more depending on the unit size and labor rates in your area.

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