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LG Therma V fault CH17

Problem in water-outlet sensor

Heat pump

What it means

Indoor unit or outdoor unit sensor open/short condition detected for the water-outlet sensor.

Likely causes

  1. Sensor mismatch on the Main PCB (Indoor, Outdoor)
  2. Main PCB (Indoor, Outdoor) defect
  3. Sensor failure (Reason of major defect)
  4. Temperature sensor maximum reached

Where to start

  1. Is the sensor correctly connected to the main PCB (indoor)? If No, re-attach the sensor to the main PCB.
  2. Is the Thermistor installed in the correct location? Check the Thermistor is removed or mis-inserted. If No, place the thermistor in the correct position.
  3. Is the sensor connector pin missing or is the sensor wire damaged? If No, replace the sensor.

The full answer, free

  • 2 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 73), right under the answer
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Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.

From the LG manual for the Therma V. Check the model on the data plate before you order parts.

Other LG Therma V fault codes