Adi pot f4 indicates that the gas has stopped or the pressure is too low. According to relevant public information, the reason why the boiler shows F4 is that the gas has stopped, and the gas stove can't ignite normally at this time. Call the gas company. Open the boiler air valve. After the gas meter is turned off, it will automatically lock when it is not used for a long time and needs to be turned on. If the gas proportional valve fails, call a professional to repair it. The pressure of natural gas is too low to meet the requirements of boiler for natural gas pressure, so it is necessary to install flue flow limiting ring and enlarge flue. When the neutral wire and live wire of the boiler power supply are connected reversely, it is necessary to check the terminal of the circuit board and change the connection position of the two wires. Some parts inside the boiler are damaged. If you apply for after-sales, please find someone to repair it.