Baxi E119 Fault Code: What It Means And How To Fix It

If your Baxi boiler is showing an E119 fault code or E119 error code, it usually means the water pressure in the system has dropped too low for the boiler to run. The boiler locks out until the pressure is brought back up.

We’re Hinckley Plumbing & Heating — Gas Safe registered engineers covering Hinckley, Nuneaton, Leicester, Tamworth, Coventry, Rugby, and Loughborough — and this guide explains what the Baxi E119 fault code on a boiler means, the most common causes, how to fix it, and when to call us.

What Does The Baxi E119 Fault Code Mean?

The Baxi E119 fault code is a low water pressure fault. The boiler has detected that the pressure in the central heating system has fallen below the minimum it needs to operate.

You will usually lose heating, hot water, or both. On many Baxi models — including the 400, 600, 800 and Platinum ranges — E119 is one of the most common codes homeowners see. Some older Baxi and Potterton models show E118 for the same underlying problem, so it’s worth checking your manual to confirm which applies to yours.

What Is The Baxi E119 Error Code On A Boiler?

The Baxi E119 error code on a boiler is another way of saying the system pressure is too low.

In plain English: there is not enough water moving around your radiators for the boiler to work properly, so it has stopped.

What Causes The Baxi E119 Fault Code?

The most common causes of the Baxi E119 fault code on a boiler are:

• Low system water pressure
• A small leak in the heating system
• Recently bled radiators
• A faulty pressure sensor
• A leaking pressure relief valve
• An expansion vessel that has lost its charge
• A filling loop problem

In most cases the pressure has simply drifted down over time and needs topping up. If the E119 error keeps returning, something is letting water out.

What Pressure Should A Baxi Boiler Be?

Most Baxi boilers should sit around 1 to 1.5 bar when cold, rising towards 2 bar as the system heats up.

If the pressure drops below around 0.5 to 0.8 bar, the boiler will typically show E119 and stop. If your gauge is already reading in the normal range and E119 is still showing, that often points to a faulty pressure sensor rather than a genuine shortage of water.

How To Fix The Baxi E119 Fault Code

If you’re confident doing it yourself, the first step is to repressurise the boiler.

1. Turn the boiler off and let it cool down.
2. Locate the filling loop underneath the boiler.
3. Open the filling valves slowly.
4. Watch the pressure gauge or display rise.
5. Stop when the pressure reaches around 1 to 1.5 bar.
6. Close both valves fully.
7. Reset the boiler if needed and check whether E119 has cleared.

Baxi boilers vary in how they are filled. Some use a braided filling loop with two valves, others use an internal filling link with a lever, and some of the newer models have a keyed system. If you’re not sure which setup you have, check the manual before turning anything.

One thing worth knowing: if you overfill past around 2.5 bar, you’ll usually need to bleed a radiator slightly to bring it back down.

Why Does The Baxi E119 Error Code Keep Coming Back?

If the E119 error code clears after topping up but comes back, the system is losing pressure again.

That might be a small leak on pipework or under floorboards, a pressure relief valve that has started to weep, or an expansion vessel that needs recharging. A tell-tale sign of a failed expansion vessel is pressure that swings sharply between cold and hot — very low when cold, near the red when the heating has been on.

Topping up repeatedly will keep things running short term, but it won’t fix the cause, and constantly adding fresh water speeds up corrosion inside the system.

When Should You Call Us About A Baxi E119 Boiler Fault?

Call Hinckley Plumbing & Heating if:

• The pressure keeps dropping after you top it up
• The E119 fault code keeps returning
• The pressure gauge reads normally but E119 is still showing
• You can see water around the boiler, radiators, or pipework
• There is a small pipe dripping outside near the boiler
• The boiler will not repressurise at all
• The heating or hot water still isn’t working after topping up

Those signs usually mean the Baxi E119 boiler fault needs proper diagnosis rather than another quick top-up.

Book A Baxi Boiler Fault Check

If your Baxi boiler is showing an E119 fault code or E119 error code, we can help.

We cover Hinckley, Nuneaton, Leicester, Tamworth, Coventry, Rugby, and Loughborough, and we’ll give you a clear, honest assessment of whether it’s a simple low-pressure issue or a leak that needs tracing. Call us or use our contact form to book a boiler inspection.

Baxi E119 Fault Code FAQs

What’s the difference between Baxi E119 and E118?

Both relate to low water pressure. Which one your boiler shows depends on the model and age — check your manual to be sure.

Can I reset the Baxi E119 fault code without topping up the pressure?

Usually no. If the pressure is genuinely low, it needs bringing back up before the fault will clear.

How often should I need to top up a Baxi boiler?

Once or twice a year is normal. If you’re doing it every few weeks, there’s a leak or a failed component behind it.

Will the Baxi E119 error code go away on its own?

Usually no. In most cases the pressure needs restoring to the correct level before the boiler will start working again.