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Colchester's Heating & Plumbing Experts
Over a decade of quality heating & plumbing services.
Providing heating & plumbing services of the highest quality for over a decade across Colchester.
Worcester Bosch Boiler Fault Codes
Colchester’s Local Heating & Plumbing Experts
At Koziwarm, we understand how frustrating it is when your Worcester Bosch boiler fault codes. But don’t worry – we’re here to help you quickly and professionally identify the problem.
Take a look at our guide below for the common Worcester Bosch boiler fault codes and what they signify.
Worcester Bosch Boiler Fault Codes
Take a look at some of the most common Worcester Bosch boiler fault codes below.
EA: | No flame detected – ignition failure |
A1: | Pump running dry / low water pressure |
C6: | Fan running too fast or too slow |
D5: | Issue with the fan |
E9: | Overheating or dry fire detected |
C7: | Fan not running / Faulty fan |
229: | Flame detected when it shouldn't be |
Still unsure? Contact our team today for fast boiler repairs.


Frequently Asked Questions (FAQ's)
If you have any inquiries that aren't addressed here, feel free to reach out to our helpful engineers. You can call us at 01206 826 903 or email our team at [email protected].