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LG Therma V fault CH35

Low pressure error

Heat pump

What it means

Evaporating pressure is excessively low

Likely causes

  1. Shortage of refrigerant or leakage
  2. EEV Error

Where to start

  1. Does water come out when the refrigerant port cock is pressed? If Yes: EEPROM insertion - check connection status / reinsert; replace product due to freezing.
  2. Is the amount of refrigerant normal? If No, check: Are there any signs of piping leakage or cracks? If Yes -> refrigerant charging after welding / reconnecting the area. If No -> refrigerant amount correction (additional charge).
  3. Is the strainer located at the front and rear of the EEV normal? [Note 1 - when temperature difference between front and rear of strainer is severe, freezing condition is visually confirmed, or if temperature difference confirmed, strainer clogging should be suspected]. If No -> reconfirming the possibility.

The full answer, free

  • 2 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 114), 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