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LG Therma V fault CH232

Reference table correlating water flow rate (l/min) to expected sensor output voltage...

Heat pump

What it means

Reference table correlating water flow rate (l/min) to expected sensor output voltage (V) at the CN_F_SENSOR connector (Blue/4), used to verify sensor operation during CH232 diagnosis.

Likely causes

  1. Flow sensor is electrically open
  2. Water pump is in trouble
  3. Cable interference around the flow sensor causing false switch state detection
  4. Use of compressed air or oxygen for leak testing

Where to start

  1. View Current flow rate on the service/display screen to verify actual system water flow rate.
  2. Step 3: If pressure OK, check water pump still running (vibration test at terminal box, or 'Water Pump Operating' on control panel) - if NO, investigate flow sensor (branch B)
  3. Step 4: If pump running, check if control panel shows CH14 - if NO, condition is normal (END); if YES, investigate water pump trouble (branch C)

The full answer, free

  • 4 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 77), 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