Domestic evaporative cooler should be cleaned before operation each summer.This involves electrical disconnection of the unit, checking the condition of the filters and cleaning or replacing as necessary. Checking the water distribution system including the pump and water bleed-off system. The water pump should be cleaned and checked for bearing or impeller problems.The fan should be inspected and any faulty parts replaced, such as the fan belt or bearings. The units sump should be flushed out and cleaned and the correct operation of the float valve checked.
The unit should be chemically dosed with disinfecting tablets to minimise the build up of bacteria, algae and mould.