The most common problems with solar water heaters are broken or malfunctioning valves, leaks, and low pressure. If you're handy with tools and have some basic knowledge of plumbing, you can usually fix these problems yourself. Here are some tips:If your solar water heater has a broken valve: Shut off the water supply to the solar water heater by turning off the valve at the household water main. Disconnect the hoses from the valve at both ends. Use a wrench to remove the nut that holds the valve in place. Remove and replace the valve.

You can repair a solar water heater by checking to see if there is any damage to the panels, cleaning the panels if they are dirty, and making sure that nothing is blocking the path of the sun's rays. If there is any damage to the panels, you can replace them; if the panels are dirty, you can clean them; and if something is blocking the path of the sun's rays, you can move it.