It is law for landlords to carry out cp12s to make sure that all gas appliances within the property are safe and conform to current regulations. This must be carried out by a gas safe registered engineer.
-Let by tightness test. Check for gas leaks
-Check standing, working pressure
-Check appliances have adequate ventilation
-Test flue flow and spillage test to ensure removal of products of combustion
-Check correct operation of flame failure devices
-Check appliances – effectiveness of stability brackets (where appropriate)
-Check case seals
-Investigate any evidence of unsafe operation and report to responsible person. An appliance cannot be deemed safe until all of above has been carried out.