Worcester Bosch EA Fault Code: What It Means

If your Worcester Bosch boiler has flashed up an EA code and you're stood in the kitchen with no heating or hot water, you're not alone. It's one of the more common faults reported on Worcester Bosch appliances, and it usually means the boiler has tried to fire up and failed, then locked itself out as a safety measure.

The good news is that an EA code doesn't necessarily mean a new boiler. But it does usually need a Gas Safe registered engineer to sort properly, rather than repeated resets.

What the EA code actually means

On most Worcester Bosch models, including the Greenstar range, EA is a lockout code related to ignition failure or flame loss. In plain English: the boiler tried to light the burner, but either couldn't get a flame going or lost the flame shortly after ignition. Rather than keep trying and risk a bigger problem, the control board shuts things down and shows the fault.

It's a symptom, not a diagnosis. The actual cause can be mechanical, electrical, or related to gas or air supply.

Common causes of the EA fault

A handful of issues tend to be behind most EA lockouts:

• A faulty or dirty ignition electrode, so the spark isn't reliably lighting the gas
• A failing flame sensor (sometimes called a flame rectification probe) that can't confirm a flame is present
• Low gas pressure or a partially closed gas valve
• A blocked or restricted flue, which affects air intake and combustion
• A fault with the printed circuit board (PCB), though this is less common than the mechanical causes above
• Condensate blockages in colder weather, which can indirectly trigger ignition problems

If your boiler has also been losing pressure or making odd noises before the fault appeared, mention this to whoever comes to look at it. It can help narrow down the cause faster. Unusual sounds around ignition are also worth flagging, our guide on boiler making banging noise covers what different noises tend to mean.

Is it safe to reset the boiler yourself?

Most Worcester Bosch boilers let you reset a lockout by holding the reset button for a few seconds. It's fine to try this once. If the boiler fires up and runs normally, it may have been a one-off blip.

If the EA code comes straight back, stop resetting it. Repeated resets on an ignition fault can be a sign of a genuine gas or electrical issue, and it's not something to keep working around. This is exactly the kind of fault the Gas Safe Register warns homeowners about, gas appliances should only be opened up and repaired by a registered engineer.

When to call an engineer versus consider a replacement

A single ignition fault on an otherwise reliable boiler is usually a straightforward repair, an electrode or sensor replacement, or a flue check. But if your boiler is older, has needed several call-outs in the past year, or the EA code is one of several recurring faults, it may be more cost-effective to look at signs you need a new boiler rather than keep paying for repairs.

Regular boiler servicing also reduces how often faults like this crop up, since a service checks ignition components, gas pressure and the flue before they fail outright. The Energy Saving Trust notes that a well-maintained boiler also tends to run more efficiently, which matters given how much of a typical energy bill goes on heating.

Getting it sorted

Don't sit on an EA fault hoping it resolves itself, a boiler that won't ignite reliably needs proper attention. If you need someone out quickly, Norvera can arrange a Gas Safe engineer for an emergency callout across the Midlands. And if your boiler's age or repair history suggests it's on its last legs, you can get a fixed price on a replacement with no obligation.