Why is my boiler pressure low?

The pressure on your boiler can go up or down for different reasons. Whether you have high or low boiler pressure, we explain how to adjust it and what to do if your boiler keeps losing pressure.

Here are several reasons why the pressure in your boiler is too low.
  1. Overtime, it is quite normal for air to get into the system. You can tell if this has happened because you can feel cold spots on your radiators. 
  2. Try bleeding the radiators, then topping up the pressure on the boiler.
  3. There’s a leak somewhere in the central heating system. Check pipes, radiators and radiator valves for signs of a leak, such as rust, corrosion or staining. You may not notice any water, because it may evaporate due to the heat of the pipework before it has the chance to drip. 
  4. The expansion vessel inside your boiler may need recharging or replacing. This is a job for a qualified, Gas Safe registered heating engineer.
  5. There could be debris inside the pressure relief valve. This is the safety valve that usually discharges water if the pressure in the system gets too high. If it is dripping with water and the pressure gauge is too low, your Gas Safe registered engineer will need to clean out or replace the safety valve. 
How can I top up the pressure on my boiler?

It is quite simple to top up the pressure in your boiler. You should be able to do it yourself without having to call a heating engineer. Before attempting to top up your boiler pressure, please watch the video below.
If you prefer not to do this yourself, or can’t manage, your Gas Safe registered engineer or Baxi Customer Support will be pleased to help, although you will have to pay.

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