A Baxi E119 means the water pressure in your heating system has fallen below 0.5 bar, so the boiler has shut down until it’s topped up. The pressure usually goes through a small leak, recently bled radiators, a failed expansion vessel or a pressure relief valve letting water by. If your Baxi is getting on and E119 keeps coming back, a new Baxi boiler is usually the better long-term option for efficiency and lower repair bills.
We’re Clever Energy Boilers. Our team is Gas Safe registered (no. 554138), we’re accredited Worcester Bosch installers, and we fit new boilers from our base in Bingley across Yorkshire, the North West and the Midlands, with more than 25,000 installations behind us over 15 years. This guide covers what E119 means, which code your model uses for the same fault, how to top up safely and when a leak needs an engineer.
What does the Baxi E119 error code mean?
Baxi describes E119 as “water pressure switch not operated”. The pressure in the primary circuit, the water running between the boiler and your radiators, has dropped below 0.5 bar, and the boiler won’t run with that little water in it.
It shows on the Platinum Combi, the Duo-tec (including the 2015 user guide), the Main Eco and the Potterton Promax. Some people search for it as “E1 19”, splitting the code in two, and our Baxi E1 error code guide explains how to read the full number.
Baxi doesn’t use E119 on every boiler, and plenty of websites mix the codes up. This is the code each model shows for low pressure:
| Baxi model | Low pressure code |
|---|---|
| Platinum Combi, Duo-tec, Main Eco, Potterton Promax | E119 |
| EcoBlue Advance, Assure Combi, original 600 and 800 Combi (624, 630) | E118, sometimes just 118 |
| 200 and 400 Combi, 400 Combi 2.1, 600 and 800 Combi 2 and System 2, Assure 500 Combi 2 | H.02.07, A.02.06 or E.02.07 |
On the dotted-code models an A code is a warning, an H code clears itself once the problem’s fixed and an E code needs a reset. If yours shows H.02.07, our Baxi H.02.07 error code guide covers it in detail. The checks are the same whichever code you see.
Why is my Baxi boiler showing an E119 fault?
Water is leaving the sealed system somewhere, or the boiler only thinks it is. Most likely first:
- A leak on a radiator, valve or pipe. Even a slow weep from a radiator valve will lose pressure over a few days. Our guide to leaking boilers covers where to look.
- Recently bled radiators. Bleeding lets water out with the air, and E119 can follow if nobody topped up afterwards.
- A failed expansion vessel. It helps keep system pressure steady, so when it fails, pressure problems follow.
- A leaking pressure relief valve. Drips from the pipe that runs outside from the boiler are the clue, and our guide to a boiler overflow pipe dripping explains it.
- A stuck pressure switch. Now and then the pressure is fine and the switch itself has failed.
- A leak inside the boiler. Engineers report leaks at the diverter valve spindle, inside the casing.
- A frozen condensate pipe. Baxi lists E119 among its frozen-condensate codes.
That last one surprises people. In a cold snap on the exposed hillsides around Queensbury and Thornton, check the plastic pipe outside before assuming you’ve got a leak. Our guide to defrosting a condensate pipe shows how.
Is the Baxi E119 fault dangerous?
No. E119 is the boiler protecting itself from running with too little water, and topping up is a normal homeowner job. Keep an eye out for a leak dripping near electrics. If you ever smell gas, open the windows, turn the gas off at the meter and call the National Gas Emergency Service on 0800 111 999.
What can I safely check at home when my Baxi shows E119?
Work through these in order:
- Repressurise. With the boiler off and cool, open the filling loop valves slowly and watch the gauge rise to 1 to 1.5 bar (older Baxi guides say 1 to 2 bar), then close both valves fully. Our step-by-step guide on how to repressurise a boiler walks you through it, and what boiler pressure should be explains the gauge.
- Reset. Hold the reset (R) button for 5 seconds.
- Look for leaks. Check under the boiler, round the radiator valves and along any visible pipework for drips or damp.
- In frosty weather, check the condensate pipe. Pour warm water over a frozen section, never boiling.
When should I stop resetting the E119 error and get a Gas Safe engineer?
When you’re topping up more than once in a few weeks. That points to a leak or a failed part, and resetting won’t touch it. A Gas Safe registered engineer can check the expansion vessel charge, test the pressure relief valve, look inside the casing for a leak at the diverter and test the pressure switch. Never open the boiler yourself to hunt for the leak.
Why does the Baxi E119 fault code keep coming back?
Because topping up treats the symptom. Each refill puts fresh water in while the leak carries on, slowly damaging parts. Bleeding radiators again and again, or living with a damp patch, keeps the cycle going. Our guide to a boiler losing pressure goes into the less obvious causes.
Is an E119 error a sign you need a new Baxi boiler?
Not after a single top-up following a round of radiator bleeding. Regular top-ups on a Baxi that’s 10 years or older are different, because they usually mean several parts are wearing out together, and the costs add up quickly:
| Baxi E119 repair | Typical UK cost |
|---|---|
| Expansion vessel (part only) | £45 to £160 |
| Pressure relief valve, fitted | £100 to £200 |
| Diverter valve | £200 to £450 |
| Engineer labour | £50 to £80 per hour |
Source: MyJobQuote, October 2026.
The Baxis that use E119, like the Platinum and Duo-tec, are now roughly 10 to 18 years old. If you’re facing vessel, valve and diverter work on a boiler that age, a new one is usually the better spend. Our guide on when a boiler needs replacing lists the other signs, and new boiler costs shows what to budget.
Get a new Baxi boiler with Clever Energy
We fit new Baxi boilers in Leeds, Bradford, Bingley, Halifax, Keighley and the rest of Yorkshire, along with the North West and the Midlands. All our installers are Gas Safe registered, a long, market-leading warranty through Clever Energy is on offer with every new boiler, and boiler finance lets you spread the cost. See our Baxi boiler installation page, get a fixed price online in a few minutes, or request a callback. If you’d rather talk it through, call 0330 055 2210 between 8am and 8pm on weekdays or 10am to 4pm at weekends.
Baxi E119 fault code FAQs
How do I repressurise a Baxi showing E119?
Use the filling loop under the boiler. Open both valves slowly until the gauge reads 1 to 1.5 bar, close them firmly, then reset.
How do I reset a Baxi E119 error?
Top up first, then hold the reset (R) button for 5 seconds. Resetting without topping up won’t clear it.
Why does my Baxi keep losing pressure?
Usually a leak on a radiator, valve or pipe, a failed expansion vessel or a leaking pressure relief valve. Repeated top-ups mean it’s time for a Gas Safe registered engineer.
What should the pressure gauge read on a Baxi?
Between 1 and 1.5 bar when cold, although Baxi’s older guides allow 1 to 2 bar. Below 0.5 bar triggers E119.
Is the Baxi E119 code the same as E118?
Yes, it’s the same fault. The Platinum and Duo-tec show E119, the EcoBlue, Assure and original 600 and 800 Combi show E118 or 118, and newer dotted-code models show H.02.07.
More Baxi error codes
Before this one in our set is the Baxi E168 fault code, the one Baxi doesn’t document. After it, the Baxi E20 fault code covers the central heating sensor. Low pressure is also a cause of circulation and overheating lockouts, so the Baxi E125 fault code and Baxi E110 fault code are worth knowing.
The E133 and E160 codes have their own guides as well, and every code is listed on our Baxi boiler error codes page.