What does error code 7 mean on an ATLANTIC ZENEO heater and how can it be resolved?

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Error code 7 on an Atlantic Zeneo thermodynamic water heater indicates a fault in the "Anti dry heating" detection system. This system protects the device from dangerous overheating in the absence of water or due to an electrical conductivity problem with the water.

Absence of water in the water heater — This is the most common cause of this error. Check that the water heater is properly filled with water. To do this, open a hot water tap: water should flow normally. If no water comes out or very little, the tank is empty or insufficiently filled. Fill the device by opening the cold water supply and leaving a hot water tap open until a continuous flow of water appears. Let the device rest for 30 minutes, then restart it.

Water too low in conductivity or insufficient hardness — The Zeneo operates correctly only with water that has a hardness greater than 15° French. If your water is too soft (distilled water, rainwater, or in a region with very soft water), the anti-corrosion protection system cannot function properly and triggers error 7. Check with your water supplier about the hardness of your water. If it is insufficient, you need to install a water softener that complies with standards (CSTB approved in France) and is correctly adjusted.

Faulty connections or anti-corrosion system — If error 7 persists after checking the filling and water hardness, it may be due to a disconnection of the internal connectors of the anti-corrosion protection system or a fault in the heating element. Turn off the device completely for 30 minutes, then restart it. If the error reappears immediately after restarting, the protection system is defective and the heating element needs to be replaced.

If in doubt or if the error persists despite these checks, contact an authorized Atlantic installer or customer service. The Zeneo comes with a 2-year warranty on the device and 5 years on the tank, which may cover a replacement of the heating element if the cause is a manufacturing defect.

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