1, water.
Unplug the power plug, then close the cold water angle valve and open the overflow valve to discharge hot water from the hot water switch. When the hot water stops flowing, close the hot water angle valve, remove the connecting screw of the hot water angle valve, and let the water in the water heater slowly flow out of the overflow pipe.
2. After the water is drained, you can take down the water heater. The water heater is hung on the back wall and can be taken down with both hands. Then remove the four screws at the left-hand end of the water heater, remove the baffle, and expose the internal circuit board and heating pipe.
3. Remove the terminal plug-in and pull it out by hand. Remove the ground wire, water level detection sensor connection wire and temperature sensing connection wire.
4. Unscrew these five screws and take out the heating pipe. This link took a lot of effort, and I once wanted to give up, because I didn't know the specific structure inside, so I couldn't pull it and didn't dare to use too much force. In fact, it is the scale that prevents the hot water pipe from being taken out smoothly. Just use a little force and come out sideways at the back corner.
5. Clean the heating pipe and cylinder.
6. This is the cleaned scale, which is much less than expected. The outer diameter of the heating pipe flange is 125mm. If necessary, you can buy it online.
7. Put it back in the reverse order of disassembly, then fill it with water, plug it in and test it.
Extended data:
Matters needing attention in using Midea electric water heater:
1. Before connecting the power supply for the first time or for the second time after maintenance and cleaning, the water heater must be filled with water.
2. The diameter of the power cord used by the water heater must meet the requirements of the rated current value of the water heater.
3. The power socket must have a solid grounding wire.
4. Don't pull the power plug with wet hands. Unplug the power supply when it is not used for a long time.
5. The relief valve shall not adjust its relief pressure by itself.
6. If you want to connect the discharge pipe at the pressure relief port of the safety valve, the discharge pipe must face downwards and be connected to the atmosphere.
7. In winter, if the water heater is not used for a long time, the water in the water tank should be drained to prevent the water tank from being damaged by ice. Be careful: it is necessary to cut off the power supply.
8. The maximum temperature of the water heater can reach above 75℃. When using water for the first time, try the water temperature first to prevent scalding.
9. The water quality and hardness are different in different regions. The water in the water heater should be discharged regularly, cleaned and descaled.