When there is no hot water in the water tank, cut off the power supply, close the water inlet valve, lift the mixing valve to the hot water outlet state, and then remove the drain nut on the left side of the bottom of the water tank and the magnesium rod inside with an adjustable wrench. Drain the water. After the water is drained, temporarily screw on the drain nut, add some water to the water tank, and then drain it. Repeat this several times to clean the scale and stains in the water tank, then wipe the drain outlet and the screw on the nut, and finally install and reset the magnesium rod and the drain nut. Remove the water pipe nut below the pressure relief valve on the right side, then remove the hydraulic valve, replace and install a new pressure relief valve, and screw on the lower water pipe joint nut to fill the water tank. When the nozzle sprays water It means that the water tank is full and can be powered on to test the machine. Take out the spring and valve core from the disassembled old pressure relief valve, check whether the valve core is in good condition, whether the sealing ring is aging, and whether the elastic force of the spring is not enough. You can open a section to increase the elastic force. If it can be used after repair, keep it for backup.
