🔴 Worcester Bosch Fault Codes — Quick Reference
| Code | Meaning | Action |
|---|---|---|
| EA 229 | Condensate pipe blocked/frozen | Thaw pipe, then reset |
| E9 | Safety temperature limiter tripped | Call engineer |
| A1 | No or weak flame signal | Call engineer |
| D5 | Flue/air supply issue | Check flue, call engineer |
| C6 | Fan speed too high | Call engineer |
| H07 | Low water pressure | Repressurise system |
| CE 207 | Gas valve fault | Call engineer urgently |
| 227 | Burner lockout | Reset, call if persists |
❄️ EA 229 — Frozen Condensate Pipe (Most Common)
The EA 229 error is the most common Worcester Bosch fault code in winter. It means your condensate pipe — the white plastic pipe that removes acidic water — has frozen or become blocked.
How to fix EA 229 yourself:
- Find the condensate pipe (white plastic pipe exiting through an outside wall)
- Pour warm (NOT boiling) water along the pipe
- Or apply a hot water bottle to the frozen section
- Once thawed, press the Reset button on the boiler for 3 seconds
- The boiler should fire up normally
If the boiler keeps showing EA 229: There may be a blockage rather than a freeze. Call FE Maintenance — we'll clear the blockage and insulate the pipe to prevent future freezing.
📉 H07 — Low Water Pressure
The H07 error means your boiler pressure has dropped below the minimum required level (usually 0.5 bar). This is a common fault that you can usually fix yourself.
How to repressurise a Worcester Bosch boiler:
- Turn the boiler off and let it cool for 10 minutes
- Find the filling loop (usually a silver braided hose under the boiler)
- Open both valves slowly until the pressure gauge reaches 1.0-1.5 bar
- Close both valves
- Turn the boiler back on
If your boiler keeps losing pressure: You may have a small leak in the system. Call FE Maintenance — we'll trace and fix the leak to stop the problem recurring.
Frequently Asked Questions
EA 229 means the condensate pipe is frozen or blocked. This is very common in cold weather. You can often fix it by pouring warm water on the pipe and pressing the reset button. If it keeps returning, call FE Maintenance on 020 8445 1303.
Press and hold the Reset button (usually marked with a flame symbol) for 3-5 seconds until the error code clears. If the boiler goes off again after resetting, there is an underlying fault that needs a Gas Safe engineer.
A1 indicates a flame detection or ignition fault. Do not keep attempting to reset. Call a Gas Safe engineer — this fault can indicate a gas valve or ignition electrode issue that needs professional repair.
Simple fixes like pressure or condensate issues cost £80-150. Component replacements like PCBs or gas valves typically cost £200-400 including parts and labour. FE Maintenance provides fixed price quotes — call 020 8445 1303.
If your Worcester Bosch boiler is over 10 years old and repair costs exceed £400, a new boiler is often better value. Modern A-rated Worcester Bosch boilers can save £200+ per year on energy bills. We'll give you honest advice.
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