Before you panic that you're going to be out of pocket, consider two things.
Worcester Bosch have excellent warranties, very often stretching to a huge 10-years. Dig out your paperwork or check your emails to find out how long your warranty was and if it's still covered. The Greenstar i is Worcester's most popular combi boiler because it's efficiency and excellent reputation so there's a good chance yours will still be covered by the manufacturer warranty.
Remember that you will likely have had to keep up your annual boiler service appointments to uphold the warranty - your boiler warranty paperwork will detail this.
All of the below error codes are issues with the boiler itself, so if it's been installed by a legitimate Gas Safe heating engineer and you've had it serviced once a year, then Worcester will send an engineer out to get the issue resolved at no cost.
Compare quotes for a new Worcester Bosch Greenstar i below:
The old cliché of 'turn it off and on again' really can work sometimes. It's not that this will actually mend any genuine issues with the boiler, but sometimes an error code can be shown in, well, error. If this has happened and there isn't a genuine mechanical problem then a reset should make the boiler realise it shouldn't be displaying an error code and continue to function as normal after starting up again.
In order to reset your Worcester Greenstar i - press and hold either the 'reset' or '✔' button for approximately 8 seconds or until you can clearly see that the system has rebooted. If it's been effective, the word 'reset' will appear on screen before returning to the default menu. The boiler will now be restored to its factory settings so if you had any bespoke settings in use, you'll need to apply these again.
|Fault code||Description||Heating engineer required initially?||Potential repair cost range|
|FD||Power interrupted||No - refer to manual & reset||£0-£100|
|C7||Fan not running on start-up||Yes||£100-£300|
|C6||Fan speed too high or too low||Yes||£100-£300|
|C1||Fan stopping during operation||Yes||£100-£300|
|C4||Fan has failed to stop||Yes||£100-£300|
|E2||Flow temperature issue||Yes||£60-£100|
|E9||Primary flow temperature exceeding 95°||Yes||£60-£100|
|FA||Ionisation detected after gas valve closed||Yes||£100-£250|
|EA||No ionisation detected after ignition||Yes||£100-£140|
|F7||Ionisation detected before burner start||Yes||£100-£250|
|9U||Control box defective or loose||Yes||£200-£300|
|C4||Control box or heat control module defective||Yes||£200-£300|
|F0||Gas valve/control box error||Yes||£250-£320|
|A8||Heat control module invalid||Yes||£100-£150|
|CC||Outdoor sensor defect||Yes||£200-£250|
|A7||Domestic hot water sensor defect||Yes||£90-£150|
|A1||Pump stuck or running dry||Yes||£200-£300|
|E9||Flue or high limit thermostat activated||Yes||£100-£150|
|D4||Primary flow temps rising too fast||Yes||£200-£300|
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