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LG Therma V fault 15

Overheating of water pipe

Heat pump

What it means

Error (serious fail - system cannot be used before repair). The temperature of the water pipe has exceeded a certain temperature.

Likely causes

  1. The temperature of the water pipe has exceeded a certain temperature
  2. Water leaking inside the product and accessories
  3. Water leaking from water pipes and accessories (connections, heat storage tanks, etc.)
  4. Valve in the water pipe is locked/closed
  5. Blockage by foreign substances in the water pipes such as struts

Where to start

  1. Check if water leaks inside the product and accessories
  2. Check if water is leaked from the water pipes and accessories (connections, heat storage tanks, etc.)
  3. If leakage occurs, reconnect leaking parts or replace damaged parts and reinforce

The full answer, free

  • 3 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 71), 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