At a glance

  • Use the pressure range in your own boiler manual.
  • Note whether the system was hot or cold when you read it.
  • Repeated topping up is a reason to arrange a check.

Start with your own boiler

If your heating system has a pressure gauge or digital pressure display, find the user manual for the exact model. The normal range and any homeowner procedure must come from that manual. Not every heating system uses the same arrangement, so a number from someone else’s boiler is not a reliable instruction for yours.

Read the display without removing covers. Write down the reading, date and whether the heating had been running. Pressure changes as a sealed heating system warms up and cools down; comparing readings taken under similar conditions gives the engineer a clearer picture.

Look for a pattern, without taking anything apart

Has this happened once after recent work, or are you repeatedly noticing a drop? Tell the office how often you have needed help and whether there are any error messages. If you can safely see a damp patch around accessible radiator fittings or pipework, note its location. Do not lift floors, reach behind the boiler or touch hot components to investigate.

A photograph of the visible gauge and a short description of the timeline can make the first conversation easier. If you do not know the previous reading, say so. There is no need to delay reporting an active leak while collecting a complete history.

Know when to arrange a repair assessment

Frequent pressure loss, unusual rises or water escaping from the system need assessment. Continuing to top up can leave the underlying problem unresolved. Tell us if pressure changes coincide with a loss of heating, a recent radiator replacement or visible water outside.

Only carry out a homeowner top-up procedure if your manufacturer explicitly provides one for your model and you can follow it safely. If the controls are unclear, inaccessible or different from the manual, stop and ask for help. Do not open the casing or adjust safety devices.

Your quick checklist

  • Make and model
  • Visible reading and hot/cold status
  • Any error message
  • Frequency of pressure changes
  • Location of any visible leak
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Turn a question into a clear next step.

Tell Corva what is happening at your property, your postcode and the help you need. We’ll discuss the appropriate visit, scope and availability across North Wales and the North West.

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Further reading

For appliance instructions, always use the manual for your exact model. These official sources provide further background.