1, solar water temperature is too high, has more than 100 degrees, the water will reach the boiling point of air pressure, resulting in hot water pipe pressure is greater than the pressure of cold water pipe.

2, the control of hot water solenoid valve opening adjustment is unreasonable, the summer opening is too large, I guess the winter is more appropriate.

3, in the cold water pipe to install a one-way cutoff can also be.