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Error code reference

LG Heat Pump Error Code CH41

Problem in discharge-pipe temperature sensor (inverter side).

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What the CH41 error code actually means

Your LG heat pump is detecting a problem with a temperature sensor that monitors how hot the refrigerant gets as it leaves the compressor. The system uses this reading to protect itself from overheating, and when the sensor stops reporting correctly, the unit shuts down or limits its operation as a precaution. This is not an immediate safety emergency for your home, but the system will not run normally until the sensor or its wiring is repaired.

Diagnostic procedure

The full CH41 procedure

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1
First diagnostic step
Check connector connection; measure resistance (200k ohm at 25°C unplugged) or voltage (4.5Vdc at 25°C plugged).
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Most common causes of CH41

Ranked by how often they cause this code
  1. 1Loose or corroded connector
  2. 2Failed discharge-pipe temperature sensor
  3. 3Damaged wiring harness
  4. 4Control board fault

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Questions people ask about CH41

What does CH41 mean on a LG heat_pump?
CH41 indicates a problem with the discharge-pipe temperature sensor on the inverter side of the heat pump. This sensor measures refrigerant temperature at the compressor outlet and is critical for protecting the variable-speed compressor from overheating. The fault is triggered when the sensor signal falls outside normal parameters due to a bad connection, a failed sensor, or wiring damage.
Is it safe to keep running my heat pump when CH41 is displayed?
You should not attempt to force the unit to run while CH41 is active. The discharge-pipe sensor protects the compressor from overheating, and operating without accurate temperature feedback could result in compressor damage, which is a costly repair. Allow the system to remain off until the fault is diagnosed and corrected.
Will resetting the heat pump clear the CH41 code?
A power reset may temporarily clear the code if the fault was caused by a momentary signal interruption, but if the underlying issue persists, the code will return shortly after the unit restarts. Resetting without diagnosing the root cause is not a reliable fix. The sensor resistance and connector should be inspected before assuming a reset has resolved the problem.
Can I fix CH41 myself, or do I need a technician?
Checking and reseating the sensor connector is something a confident DIYer can attempt. However, measuring sensor resistance and voltage, tracing wiring faults, and replacing components on the inverter circuit require comfort with electrical diagnostics and refrigerant system safety. If you are not experienced with HVAC electrical work, a qualified technician is recommended.
How much does it cost to repair a CH41 error on an LG heat pump?
If only the connector needs reseating, there may be no parts cost, though a service call typically runs between 80 and 150 dollars. A replacement discharge-pipe temperature sensor is generally an inexpensive part, often in the 20 to 60 dollar range, with total repair costs including labor usually falling between 100 and 300 dollars. Control board replacement, if required, would be significantly more expensive.

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