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Error code reference

LG Heat Pump Error Code E162

The 2nd MCU SOL V/V cooling/heating opening at the same time.

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What the E162 error code actually means

Your LG heat pump has detected that two important internal valves, one for cooling and one for heating, are both trying to open at the same time when only one should ever be open. This is like a traffic signal showing green in two opposing directions simultaneously, and the system has shut down to protect itself. A technician will need to inspect the wiring and control board to find out why both valves are receiving power at the same time.

Diagnostic procedure

The full E162 procedure

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1
Confirm the fault
Power cycle the unit: switch off the breaker for 60 seconds, then restore power. If the code returns, the fault is persistent and the procedure below isolates the cause.
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Most common causes of E162

Ranked by how often they cause this code
  1. 1Wiring harness short circuit between valve signal lines
  2. 2Failed or stuck solenoid valve coil
  3. 3Faulty second MCU control board
  4. 4Corroded or contaminated connector at the MCU or valve
  5. 5Software or firmware fault in the second MCU

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Questions people ask about E162

What does E162 mean on a LG heat pump?
E162 indicates that the second MCU has detected the cooling and heating solenoid valves both opening at the same time. These two valves should never be open simultaneously, as they control opposing refrigerant flow paths for each operating mode. The system triggers this fault code as a protective measure to prevent refrigerant circuit conflicts and potential compressor damage.
Is it safe to keep running my LG heat pump with error code E162?
No, you should not continue operating the heat pump while E162 is active. Simultaneous opening of the cooling and heating solenoid valves can cause refrigerant to flow through conflicting circuit paths, which may damage the compressor or other refrigerant circuit components. The system should remain off until the fault is diagnosed and repaired.
Will resetting my LG heat pump clear the E162 error code?
A power cycle may temporarily clear the E162 code if the fault was caused by a transient firmware or signal issue in the second MCU. However, if an underlying hardware problem exists, such as a shorted wiring harness, failed solenoid valve coil, or defective MCU board, the error will return once the system attempts to operate again. A reset should be treated as a diagnostic step, not a repair.
Can I fix E162 on my LG heat pump myself?
Some basic checks, such as inspecting the wiring harness for visible damage and cleaning corroded connectors, can be performed by a knowledgeable DIYer. However, testing solenoid valve coils, diagnosing MCU board output failures, and handling refrigerant-side components requires proper tools and HVAC certification. It is strongly recommended to have a certified technician perform the full diagnosis.
How much does it cost to repair error code E162 on an LG heat pump?
Repair costs vary depending on the root cause. Wiring harness repairs or connector cleaning may cost between $75 and $200 in labor. Replacing a solenoid valve coil typically runs $100 to $350 including parts and labor. If the second MCU control board requires replacement, costs can range from $300 to $800 or more depending on the specific unit model and labor rates in your area.

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