Worcester Bosch Fault Codes Explained: The Ones Homeowners See Most

Worcester Bosch boilers show a fault code, usually a letter and number followed by a three-digit code, when something stops them working. The ones homeowners see most are EA 227 (the boiler hasn’t detected a flame, often an ignition or gas supply issue), CE 207 (low water pressure), E9 224 (overheat protection) and A1 280 (a water flow problem). Low pressure is often a quick fix. Most others need a Gas Safe engineer.

Always check your model’s manual, as codes vary between Worcester ranges. Our Worcester page explains how we service and repair them. We cover homes across East Kent, including Whitstable and Herne Bay.

Common Worcester Bosch codes

Code	Usual meaning	Safe checks
EA 227	No flame detected / ignition failure	Check gas is on; in frost, check condensate pipe; one reset
CE 207	Low water pressure	Top up to the recommended pressure
E9 224	Overheat safety cut-out	Check radiator valves are open; engineer if it repeats
A1 280	Low water flow or circulation problem	Check pressure; engineer if it persists
C6 215	Fan fault	Engineer needed

EA 227: the most common

This means the boiler tried to light but didn’t detect a flame. Check:

• The gas supply is on at the meter
• Other gas appliances are working
• Prepayment meters have credit
• In freezing weather, the condensate pipe isn’t frozen

Reset once. If it returns, call an engineer. It may be an ignition electrode, gas valve or flame sensor fault.

CE 207: low pressure

The gauge will be low, often below 1 bar. Top up with the filling key or loop as shown in the manual, then reset. If pressure keeps dropping, there may be a leak or a faulty relief valve.

E9 224 and A1 280: heat and flow

These point to the boiler getting too hot or water not circulating properly. Causes include closed valves, sludge in the system, a pump problem or low pressure. If they repeat, an engineer should investigate. Sludge-related problems may need a powerflush.

When to stop and call an engineer

• Any code that returns after one reset
• Fan, gas valve, sensor or circuit board codes
• Water leaking from the boiler
• A smell of gas: call 0800 111 999

Never remove the casing. Only a Gas Safe engineer should work inside the boiler. Book through our servicing and repairs page.

Worcester boilers in Canterbury, Whitstable and Herne Bay

Worcester Bosch boilers are fitted in many homes across Canterbury, Whitstable and Herne Bay. Keeping up with annual servicing reduces the chance of seeing these codes in the first place, and keeps the manufacturer’s guarantee valid.

Frequently asked questions

How do I reset a Worcester Bosch boiler?

Most models have a reset button, sometimes marked with a flame symbol, or a reset option on the display. Check your manual. Reset once only.

Why is the blue light flashing on my Worcester boiler?

On many models, a flashing light or display indicates a fault. Check the code on the display and your manual.

Is a fault covered by the guarantee?

If the boiler is under guarantee and the fault is a manufacturing defect, it may be covered, as long as the service history is up to date.

Need help with a Worcester fault?

If your Worcester Bosch boiler is showing a code you can’t clear, give us a call on 01227 200 596 or drop us a message and we’ll take a look for you.