Home & Electricity
Boiler pressure too low or too high: what to do?
Boiler pressure too low or too high: the right reflexes in a few simple steps.
Written by Mohamed IDBRAHIM · Updated octobre 13, 2026 · 7 min read
Immediate actions
- 1 Check the gauge: around 1 to 1.5 bar is normal.
- 2 Low: repressurize using the filling loop per the manual.
- 3 High: bleed a radiator to release pressure.
- 4 Call an engineer if it keeps dropping or spiking.
What not to do / warning
Constant pressure loss means a leak somewhere in the system.
When a boiler pressure too low or too high happens, the first minutes matter. Follow these steps to act safely and without panic.
What to do right now
- Check the gauge: around 1 to 1.5 bar is normal.
- Low: repressurize using the filling loop per the manual.
- High: bleed a radiator to release pressure.
- Call an engineer if it keeps dropping or spiking.
Mistakes to avoid
- Acting before removing the immediate source of danger.
- Panicking or skipping the official procedures.
- Following unverified advice from random websites.
How to prevent this in the future
Regular checks, keeping emergency numbers visible and preparing an essentials kit go a long way. Save this guide for offline access.
Frequently asked questions
What should I do first?
Ensure everyone is safe, remove the source of danger, then call the relevant number or begin the official procedure.
When should I call emergency services?
Whenever life, serious injury or fire is involved. When in doubt, call — dispatchers would rather check than miss an emergency.