No flame detected: the boiler tried to light but failed.
Check the gas is on (hob working, prepay credit) and in freezing weather check the condensate pipe. Then reset once.
Fault code finder
Worcester Bosch boiler fault codes.
Greenstar boilers show a two-character code with a three-digit cause code, e.g. EA 227. Here’s what the most common ones mean, and what to do about each.
Check, then reset once
Water pressure too low.
Re-pressurise to 1–1.5 bar using the filling loop. If it keeps dropping, there’s a leak.
Overheat: the safety thermostat has tripped.
Often low pressure, trapped air or a pump issue. Check the pressure and reset once. If it repeats, call us.
Fan fault: no fan speed detected.
Don’t keep resetting. This needs a Gas Safe engineer.
Codes vary between Worcester Bosch models, so check your manual. Reset once only, and never remove the casing.
Other brands
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FAQs
Worcester Bosch codes: your questions.
Can’t see your question? Our friendly office team is on hand Mon–Fri 8–5 and Sat 9–12.
What does Worcester Bosch fault code EA / 227 mean?
No flame detected: the boiler tried to light but failed. Check the gas is on (hob working, prepay credit) and in freezing weather check the condensate pipe. Then reset once.
What does Worcester Bosch fault code CE / 207 mean?
Water pressure too low. Re-pressurise to 1–1.5 bar using the filling loop. If it keeps dropping, there’s a leak.
What does Worcester Bosch fault code E9 / 224 mean?
Overheat: the safety thermostat has tripped. Often low pressure, trapped air or a pump issue. Check the pressure and reset once. If it repeats, call us.
What does Worcester Bosch fault code C6 / 215 mean?
Fan fault: no fan speed detected. Don’t keep resetting. This needs a Gas Safe engineer.
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