The service of the solar water heater is essential for the maintenance of the warrantee and it ensures the long lifetime of the system and it's best performance. The service must be done every 2 years from an executive technician and includes the replacement [...]
a. Lack of service. b. Loss or low level of antifreeze liquid in the closed circuit of the solar water heater system. c. Partial or total shading of the absorbent collector area. d. Little sun duration. e. Leakage in the plumbing or fittings of [...]
a. Wrong connection. b. Failure of the line from the control cabinet to the element. c. Thermostat failure. d. Short electrical resistance. e. Fall thermal safety thermostat due to overheating.
The current time that is needed with electricity is one hour and by the sun it takes two to three hours with pure sunshine in an average temperature of about 20 degrees C °.
In this case you must cover the collector surface (eg cardboard) so as to avoid the unnecessary operation of the device and damages caused by overheating of the system.