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boiler fault 51 low water pressure

Is your boiler showing a fault 51 due to low water pressure? Don't worry, we've got you covered!

Troubleshooting Boiler Fault 51: Low Water Pressure


Have you ever woken up to a cold house because your boiler isn’t working properly? One common issue that boiler owners face is Fault 51, which is triggered by low water pressure. But fear not, as we have some tips to help you troubleshoot and fix this problem so you can say goodbye to those chilly mornings!

Troubleshooting Tips

  1. Check the water pressure gauge: The first step in resolving Fault 51 is to check the water pressure gauge on your boiler. Ideally, the pressure should be between 1 and 1.5 bar. If it’s below this range, you’ll need to repressurize the system. Consult your boiler’s manual for instructions on how to do this.

  2. Check for leaks: Low water pressure can often be caused by leaks in the system. Check for any visible leaks around pipes, radiators, or the boiler itself. If you find a leak, you’ll need to fix it before repressurizing the system to prevent the pressure from dropping again.

  3. Bleed the radiators: Another common cause of low water pressure is air trapped in the radiators. Bleeding the radiators can help release any trapped air and improve the circulation of water in the system. Make sure to bleed each radiator in your home until you hear a hissing sound, indicating that all the air has been released.

Say Goodbye to Low Water Woes with These Tips

Preventative Maintenance

  1. Regularly check the pressure: To avoid encountering Fault 51 in the future, make it a habit to check the water pressure on your boiler regularly. By keeping an eye on the pressure gauge, you can catch any drops in pressure early and address them before they lead to a malfunction.

  2. Schedule professional maintenance: While DIY troubleshooting can solve many boiler issues, it’s always a good idea to schedule regular maintenance with a professional. A qualified technician can inspect your system, identify any potential issues, and perform any necessary repairs to keep your boiler running smoothly.

  3. Invest in a boiler service plan: If you want to ensure your boiler is always in top condition, consider investing in a boiler service plan. These plans typically include annual maintenance visits, priority service in case of emergencies, and discounts on repairs. With a service plan in place, you can rest easy knowing that your boiler is well taken care of.


By following these troubleshooting tips and preventative maintenance measures, you can bid farewell to low water pressure issues and ensure that your boiler keeps you warm and cozy all winter long. Don’t let Fault 51 dampen your spirits – with a little bit of know-how and regular care, you can keep your boiler running smoothly for years to come!

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