A fault or breakdown from a Worcester boiler is rare. Quickly read up on Worcester Greenstar i boiler fault and error codes, what they mean and how you can fix them. Be a Worcester whisperer.
Firstly, check your warranty
[2024 update: most points in this article are also relevant for the Greenstar i replacement - the Worcester-Bosch 4000]
Worcester Greenstars (and 4000’s), tpyically have great, long warranties - check if yours is still covered.
Dig out your paperwork - or email if you bought your boiler this century.
The Greenstar i is Worcester's most popular combi boiler (now the 4000 model) because of its efficiency and excellent reputation so there's a good chance yours will still be covered by the manufacturer's warranty.
If your Greenstar i is busted and out of warranty, get a fixed price on a brand spanking new one, fitted as quickly as tomorrow.
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.
Is your current Worcester Bosch boiler experiencing problems? Check our Worcester Bosch Boiler Faults guide for common issues and potential fixes.
If you've simply had enough, and you're considering a new replacement boiler, here's a snapshot of what we charge for a typical, straightforward combi swap:
Boiler | From Price |
|
Ideal Logic | £1,990*no longer stocked | |
Viessmann Vitodens 050-W | £2,290 | |
Viessmann Vitodens 100-W | £2,750 | |
Viessmann Vitodens 111-W | £4,180*by request | |
Worcester-Bosch 4000 | £2,250 | |
Worcester-Bosch 8000 | £2,900 |
Read our Worcester Bosch vs Viessmann Boilers review if you want a helpful comparison of these trusted boiler manufacturers.
Honestly though, flip a coin - you can’t choose wrong.
Reset your Greenstar i/4000 boiler first
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 the 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.
For more details, check out our Greenstar 30i review. Or don’t, because it’s discontinued.
Watch 2 men chat about it’s georgeous replacement, the 4000:
Worcester Bosch Greenstar i & 4000 Error/Fault codes
Fault Coce | Description | Heating Engineer Required Initially? | Repair cost (ish) |
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 |
PS Typically a Worcester Bosch error code is accompanied by a blue flashing light.
Related heating/energy guides:
Worcester totally busted?
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