How To Fix Worcester Bosch 227 Fault Code
Finding an error code on your boiler can feel stressful, especially when heating and hot water stop. Worcester Bosch error 227 often looks serious, but you can run a few safe checks first. Quick action can prevent bigger faults and reduce repair costs. This guide explains what the code means, what causes it, and what you can do next.
Table of contents
What Is The Worcester Boiler 227 Fault Code
Worcester Bosch fault code 227 means the boiler cannot detect a flame during ignition. The boiler tries to ignite several times. When it fails, the safety system stops the boiler to protect your home. You may see the boiler lock out and refuse to run until you reset it or fix the cause.
Worcester 227 Fault Code Symptoms
You may notice one or more of these symptoms. The boiler tries to start, then shuts down. You hear repeated ignition attempts. The display shows 227 and the boiler locks out. Your radiators stay cold and you lose hot water. You may also notice a fault light on the front panel.
What Causes 227 Fault Code
Several issues can stop flame detection. Some issues relate to supply and external pipework. Other issues sit inside the boiler and need a qualified engineer.
Gas supply or a faulty gas valve
Low gas pressure or a faulty gas valve can stop ignition. A poorly adjusted valve can also reduce gas flow. Only a qualified Gas Safe engineer should test or adjust gas components. Call an engineer if you suspect a gas supply issue.
Frozen condensate pipe
Cold weather can freeze the condensate pipe outside. The blockage can stop the boiler and trigger 227. You can often fix this at home with care. Use warm water to thaw the pipe outside. Then reset the boiler and check if it runs normally.
Frozen gas meter or regulator issues
A frozen gas meter can affect the regulator and reduce gas flow. You may hear noise from the meter and see boiler faults at the same time. Check insulation around the meter if it sits outside. Ask a Gas Safe engineer for advice if the problem repeats in winter.
Blocked pilot jet
Dust or debris can clog the pilot jet and weaken the flame. You may see flickering before the boiler locks out. An engineer can clean this part and restore ignition. Do not open the boiler case if you lack the right qualifications.
Damaged electrode or ignition lead
The boiler needs a strong spark and a clean flame signal. Damage or dirt on the electrode or ignition lead can stop flame detection. An engineer can clean and test the parts. Replacement often costs less than repeat call outs.
Moisture on internal electrics
A small internal leak can drip onto electrical parts and cause faults. Moisture can also damage the PCB. Turn off the boiler if you see signs of a leak. Turn off the water supply if you need to limit damage. Then call an engineer to locate the source.
Heat exchanger leak
A leak from the heat exchanger can cause hidden moisture inside the boiler. You often cannot see this leak from outside the case. An engineer can inspect and confirm the fault. Early diagnosis can prevent wider damage.
PCB damage
The PCB controls the boiler and coordinates ignition. Moisture or electrical faults can damage the board and trigger repeated errors. A PCB repair or replacement can cost up to five hundred pounds. An engineer can confirm the fault and quote accurately.
How To Fix Worcester Bosch 227 Fault Code
Time needed: 5 minutes
Use these steps in order. Stop when you reach a step that needs a qualified engineer.
- Check the water pressure
Check the boiler pressure gauge. Many sealed systems run best around one to one point five bar when cold. Low pressure can trigger faults and stop ignition. Top up pressure only if you know the correct method for your model. Use the manual for guidance.
- Check the condensate pipe
Look at the condensate pipe outside. In cold weather, check for ice or a solid blockage. Thaw the pipe with warm water. Avoid boiling water because it can damage plastic pipework. Dry the area and move to the reset step.
- Reset the boiler correctly
Use the reset button or reset function on the control panel. Follow the boiler manual for the correct sequence. Watch the display during restart. If the boiler fires and stays on, the fault likely came from a temporary issue such as a frozen condensate pipe.
- Check for ignition system clues
Listen for ignition attempts and watch for repeated lockouts. If the boiler keeps failing to light, stop further resets. Repeated resets can mask the real fault and delay proper repair. An engineer can test electrodes, leads, and burner settings safely.
- Confirm gas supply integrity
Check other gas appliances in your home, such as the hob, if you can do so safely. If other appliances also fail, contact your gas supplier and a Gas Safe engineer. If you smell gas, leave the property and follow emergency gas advice from your supplier.
Common Mistakes To Avoid Boiler Issues
Many homeowners reset the boiler again and again and hope the code clears. Others ignore low pressure or skip condensate checks in winter. Some people try to open the boiler case and handle gas parts without training. These actions raise risk and can increase repair cost. Use safe checks only and book a service every year to reduce breakdowns.
When To Seek Professional Help
Call a Gas Safe engineer when the boiler locks out after a reset. Call an engineer when you see any leak, moisture, or dripping near the boiler. Call an engineer when you suspect a gas valve or ignition part fault. A qualified engineer can test components, confirm the cause, and restore safe operation.
Conclusion
Worcester Bosch fault code 227 points to a flame detection problem and you should treat it as a clear warning. Start with safe checks like system pressure and the condensate pipe, then reset the boiler the right way. If the boiler keeps locking out, or you spot leaks or gas supply issues, stop troubleshooting and call a Gas Safe engineer. A fast diagnosis protects your boiler, saves money, and restores heating and hot water sooner.
Frequently Asked Questions
It indicates that after 4–5 attempts to ignite, the boiler failed to detect a flame and has locked out for safety.
If it is winter, this is the most likely cause. Locate the white plastic pipe outside and pour warm (not boiling) water over it to defrost.
Press the reset button (often indicated by a flame with a cross or a reset icon) for a few seconds.
You can try resetting the boiler and, in winter, thawing the external condensate pipe. However, if the issue is a faulty gas valve or sensor, it requires a professional.
This error relates to issues with the boiler’s temperature sensors, which could be the flow temperature sensor, hot water temperature sensor, or heat exchanger temperature sensor. When to Call a Pro: Immediately.
