Unsafe Definitions and Not To Current Standard Situations - Codes and Explanations  
  Click on the following codes for details, category & action details.  
  A1 - Gas Escapes
  A2 - Meter / Pressure Regulation
  A3 - Meter Box/Compartment
  A4 - Report Of "Fumes"
  A5 - Installation Pipework
  B1 - Air Supply (Ventilation)
  C1 - Flues (Open Flues)
  D1 - Flues (Room Sealed)
  E1 - Appliances
  F1 - Water Heaters
  G1 - Gas Fires
  H1 - Gas Fire / Back Boiler Units
  I1 - Warm Air Heaters