Solar thermal hot water heating systems should be serviced every 2-3 years. A solar thermal system service is vital, if the system is to operate correctly.
Over time, the antifreeze breaks down and may freeze during a harsh winter. When the antifreeze is broken down, it turns to the consistency of soup and becomes more difficult to pump around the system.
Temperature sensors can become faulty and can give false readings if they are heated beyond their recommended temperatures.
Sensors can sometimes be pulled out of the correct location in the cylinder if they are not secured properly.
Software may need to be updated on the controller if it’s outdated.
Non return valves may become blocked with dirt if the antifreeze is not changed regularly (recommended every 5 years).
