plumbers in northampton

Boiler Pressure Too High or Too Low – Find Out Why and How to Repair it

The pressure inside your boiler is an balancing act between water and air, if for whatever reason this pressure becomes too low or too high your boiler will shutdown and will most likely display an error code on the boilers display panel.

Read on how to repressurise your boiler, yourself.

A common question we get asked is “What should your boiler pressure be?” and the answer is, the pressure on your boiler gauge should be between 1,5 and 2 bars when the heating is on and 1 to 1.5 bar when the heating is off.

Most boilers will have coloured markers on the pressure gauge for the safe and unsafe conditions of the pressure inside of your boiler. You will have the colour green and the colour red, the colour green means the pressure is safe and red means the pressure is unsafe.

My boiler pressure is rising to 2-3 bars?! Why is it so high? – Help!

If you see your pressure gauge rise above 2 bar, this is a clear sign that something is not right, will it blow up?

Modern boilers don’t blow up, boiler manufacturers of today make modern boilers to endure high pressure and most units should be safe.

There are several things that can cause high pressure in the boiler.

If you have recently re-pressurised your boiler because it was too low for example, the pressure may have been wrongly estimated.

Faulty component inside your boiler which is making your boilers pressure rise. Our boiler repair engineer can help and advise you on getting your boiler back up and running.

The worst thing that can happen if the pressure is high in the boiler is it will start leaking and some internal components get damaged. If you ever see your boiler leaking you should urgently call a boiler repair engineer in Northampton for help.

How to Reduce the Pressure in your Boiler

Both high and low pressure readings mean no good for your boiler and reducing the pressure in your boiler is important for keeping your boiler safe.

Here is how you can reduce the pressure in your boiler:

You will need to drain the excess water from your boiler and to do this first you need to find the drain cock and let some water out.

The tools you will need when doing this is, a drain key, a bucket to collect the water and a mop just in case of any spills.

You will also need to keep an eye on the boiler pressure gauge to keep track of any pressure changes.

How to Prevent Boiler Pressure Problems

The first thing you can do is schedule a regular boiler service, regularly bleed your radiators and make sure your boiler service engineer checks the expansion vessel as this will keep the pressure consistent and prevents sudden pressure changes.

When it comes to fixing a problematic boiler pressure issues, replacing parts or re-pressurising your boiler, if you are unsure on how to re-pressurise your boiler, you should call a gas engineer in Northampton. When it comes to replacing parts this is not DIY task and should be done by our gas engineer.

What’s important to remember is that high boiler pressure isn’t dangerous and your boiler won’t blow up, low boiler pressure isn’t any good either, your boiler will most likely fail to start. You must discuss the boiler error codes with the engineer when on the phone and aside from re-pressurising and bleeding your radiators, all other boiler problems should be inspected by a gas safe engineer.

THS Plumbing & Heating Northampton

3 Sunningdale Close



Tel: 01604 212732

Open: Monday-Sunday 7:30am - 10:00pm