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What to do when your boiler loses pressure

A pressure drop can have several causes. These safe first checks help you describe the problem without opening the boiler.

Safe first steps

  1. Check the pressure gauge and note the reading.
  2. Look for visible water around radiators, valves and accessible pipework.
  3. Note any error code and the boiler make and model.
  4. Use only the manufacturer’s instructions for user controls.

What not to do

  • Do not remove the boiler casing.
  • Do not keep repressurising a system that repeatedly loses pressure.
  • Never work on gas components yourself.