Worcester Bosch EA / 227 fault — what it means and how to fix it

What does the Worcester Bosch EA / 227 fault mean?

The Worcester Bosch EA / 227 fault means your boiler tried to light its burner, didn't detect a flame, and locked out to stay safe. In plain terms: it went to fire up, the flame either never caught or wasn't sensed, so the boiler shut itself off rather than let gas keep flowing.

EA, 227 and "227 V" are the same fault shown different ways. Older Greenstar models (like the CDi Classic and i/Si range) display the letter code "EA" on the screen. Newer models — the Greenstar 8000, 8000 Style and 4000 — show it as a number, "227", sometimes written "227 V". Same problem, same fixes. Codes can vary a little by model, so it's always worth checking it against your boiler's manual.

Good news first: on its own, EA / 227 is not a gas emergency. It usually points to something simple like a frozen condensate pipe or a gas supply that's been interrupted. The National Gas Emergency line, 0800 111 999, is only for when you can smell gas or your carbon monoxide alarm is going off — not for this code.

EA / 227 at a glance — the key facts

What causes the EA / 227 fault?

EA / 227 is a flame-detection fault, so anything that stops a flame forming — or stops the boiler sensing one — can trigger it. In Worcester Bosch's own service instructions, the EA isolation procedure works through the gas supply, the flue, the ignition and flame-sensing electrodes, the gas valve, the wiring and finally the control board, in that order.

In real homes, two causes top the list. In cold weather it's usually a frozen condensate pipe. The rest of the year it's more often a gas supply problem. The table below covers the lot, roughly most-likely first.

Why does EA / 227 keep coming back after a reset?

A reset clears the lockout, but it doesn't fix anything. If the code comes straight back — or clears and then returns when you run hot water or the boiler works harder — that's a sign of a developing fault, not a one-off glitch.

The "clears, then comes back on hot water" pattern is a common one. It often points to a tired ignition or flame-sensing electrode that can't keep up once the burner ramps up, a marginal gas valve or gas pressure that can't sustain the bigger flame, or condensate that's pooling and backing up. Whatever it is, repeated resetting only masks it — and on a persistent lockout it can add wear to the ignition components and the PCB. Reset once. If it returns, stop and book a Gas Safe registered engineer.

EA / 227 causes and symptoms

How do I fix the EA / 227 fault myself?

There are a few safe things you can try before calling anyone out. None of them involve opening the boiler or touching anything to do with gas — that's the line you never cross.

What you can safely do yourself

Three quick checks sort a lot of EA / 227 faults: make sure your gas is actually on, thaw a frozen condensate pipe, and reset the boiler once. Here's the order to do them in.

How to thaw a frozen condensate pipe

The condensate pipe is the white plastic pipe that runs from your boiler out through an external wall to a drain. In cold weather it can freeze solid, the waste water can't drain, and the boiler locks out. Thawing it is a genuine homeowner job — as long as the pipe is somewhere you can safely reach.

1. Find the white plastic pipe running from the boiler out through an outside wall.

2. Look for ice at the exposed bends, the open end, or any low or outdoor sections — that's where it freezes first.

3. Pour warm — not boiling — water along the frozen section. Boiling water can crack the plastic. A hot water bottle or a warm cloth wrapped round the pipe works too.

4. Once it's thawed, reset the boiler once and check it fires up and stays on.

5. To stop it happening again, lag or insulate the outside section of the pipe.

How to reset a Worcester Bosch boiler after EA / 227

Press and hold the reset button (the flame symbol, or the button marked "reset") for about three seconds, then let go. The boiler will run through its ignition sequence and, if all's well, fire up. The exact button varies by model, so check your manual if you're not sure which one it is.

Reset once — and only once. If EA / 227 comes back within minutes or hours, don't keep resetting. That's the boiler telling you something's genuinely wrong, and repeated resets can wear out the ignition parts and the PCB. Stop there and book a Gas Safe registered engineer.

When should you call a Gas Safe registered engineer?

Call an engineer if the code returns after one reset, if your condensate pipe isn't frozen (or keeps refreezing), or if your other gas appliances are working fine but the boiler still won't light. Electrodes, the gas valve, the pilot jet, the flue and the PCB are all engineer-only — it's illegal for anyone who isn't Gas Safe registered to work on the gas side, and it isn't worth the risk. You can check an engineer is registered on the Gas Safe Register.

While you wait, you can book a one-off repair with us and one of our Gas Safe registered engineers will come and fix it for you.

Is the EA / 227 fault dangerous?

No — EA / 227 isn't dangerous in itself. It's the boiler doing its job: it didn't get a flame, so it shut down rather than keep releasing gas. That lockout is a safety feature, not a hazard.

It is not a 999 or gas emergency. You only need the National Gas Emergency line, 0800 111 999, if you can smell gas or your carbon monoxide alarm goes off — and that's true whatever code is showing. If that happens, leave the gas alone, open the windows, turn the gas off at the meter, don't touch electrical switches, and get everyone out, then call 0800 111 999.

The one thing not to do is keep resetting it. The code clearing for a few minutes doesn't mean it's fixed — it means the fault hasn't shown itself yet. Reset once, and if it returns, hand it to an engineer.

EA / 227 vs F7 — what's the difference?

These two get mixed up because both involve the flame-detection circuit, but they're opposites.

EA / 227 means the fire's out but should be lit — the boiler tried to ignite and couldn't sense a flame. F7 is the reverse: the boiler thinks it's lit when it isn't — it's picking up a false or phantom flame signal when no flame should be there, often from a faulty flame-sensing electrode or lead, moisture, or a PCB fault. Both usually need a Gas Safe registered engineer if a single reset doesn't clear them.

How much does it cost to fix EA / 227?

It depends entirely on the cause, so the honest answer is a range. The figures below are typical UK industry costs to give you a feel for it — they are not Smart Plan's prices, and your own quote will depend on your boiler and where you live.

Think of it as a ladder. A frozen-pipe thaw is the cheapest outcome — often free if you do it yourself, or around £80–£150 if you pay someone. An ignition or flame-sensing electrode is usually the cheapest real repair, often £100–£200 fitted (up to around £300 on some models). A gas valve is more, typically £200–£400. A new PCB is the dear one, often £300–£500 and sometimes higher if water has damaged it. A diagnostic call-out on its own is usually £80–£150.

Should you repair or replace the boiler?

A thaw or an electrode fix is worth doing at almost any age. But if you're looking at a PCB or a big gas-valve job on a boiler that's already 10–15 years old and has had repeated lockouts, it's worth getting a view on a replacement. As a rough rule, once a repair creeps toward a third or more of the cost of a new boiler, replacing it often makes more sense than stacking up repairs. A Gas Safe registered engineer can tell you which way to lean.

Smart Plan is a service plan, not insurance. If you'd rather not face a surprise repair bill next time, an ongoing boiler module covers parts and labour up to your cover limit, so a fault like this is sorted for you. Cover is modular — you only pick what you want, so you don't pay for what you don't use. Boiler cover runs up to £500 per year if your boiler's under 7 years old, or up to £200 if it's older. A £95 call-out fee applies. We've looked after over 15,000 customers, we're from UK Boiler Company Ltd, trading since 2014, and we're rated on Trustpilot.

Safe checks before you call anyone out

The only things worth trying yourself with an EA / 227 fault. If none of them clear it, the next step is a Gas Safe registered engineer.

• Check your other gas appliances. If the hob won't light either, it's a gas supply issue, not the boiler.
• Make sure the gas is on — check the gas isolation valve under the boiler is open and your meter isn't off.
• In cold weather, check the white external condensate pipe for ice and thaw it gently with warm — never boiling — water.
• Glance at the pressure gauge; it should sit around 1.0 to 1.5 bar when cold.
• Reset the boiler once — just once. Don't keep resetting if EA / 227 comes back.
• Never open the casing or touch the electrodes, gas valve or wiring — that's gas work, and it's a Gas Safe registered engineer's job.
• If you ever smell gas or your CO alarm sounds, stop. Call 0800 111 999, open windows, turn off the gas at the meter, don't touch electrical switches, and leave the house.

Worcester Bosch EA / 227 fault FAQs

Seeing EA or 227? We'll come and fix it for you.

Book a one-off repair and a Gas Safe registered engineer will sort it, or set up an ongoing Smart Plan boiler module so the next fault's covered. A service plan, not insurance — parts and labour included up to your cover limit.

Helpful links

• All Worcester Bosch fault codes
• No heating? Book a repair
• Boiler & central heating cover
• More boiler guides on the blog
• Check an engineer on the Gas Safe Register