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LG Therma V fault CH08

DHW tank temperature sensor fault

Heat pump

What it means

Fault relating to the DHW Tank Temperature Sensor connected at CN_TH4. Indicates sensor open/short or out-of-range resistance/voltage reading.

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
  5. Sensor open or short circuit
  6. Connector disconnected or damaged
  7. Sensor out of specification resistance

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

  • 5 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 74), 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