Error code
Worcester Bosch Boiler Fault Code 227
Quick answer
227
System water pressure is too low
First safe action
Check the pressure gauge against the manufacturer guidance in the manual.
Meaning
Worcester Bosch boiler fault code 227 usually means the boiler has detected low system pressure and locked out to protect the heating circuit.
Likely causes
- Pressure dropped below the normal operating range
- Recent radiator bleeding or maintenance
- Ongoing water loss from a leak
Safe first checks
- Check the pressure gauge against the manufacturer guidance in the manual.
- If the boiler allows user repressurising, follow only the official filling loop method.
- Stop if pressure drops again quickly after topping up.
How to reset
- Reset the boiler only after the pressure has been restored to the correct range.
- Do not keep resetting if the pressure immediately falls again.
When to call an engineer
If pressure repeatedly drops or you notice leaks, arrange a qualified heating engineer.
Safety warning
Do not remove the boiler casing or attempt internal repairs. Use only the manufacturer-approved repressurising method, and book a qualified heating engineer if pressure keeps falling.
Useful hub links
Related fault codes
224 for Worcester Bosch Boiler
System water pressure is too low
229 for Worcester Bosch Boiler
The boiler has overheated or hit a high temperature limit
232 for Worcester Bosch Boiler
Flame detection has been lost during operation
E9 for Worcester Bosch Boiler
The boiler has overheated or hit a high temperature limit
208 for Worcester Bosch Boiler
A boiler sensor is giving an invalid reading
233 for Worcester Bosch Boiler
Flame detection has been lost during operation
Relevant guides
Frequently asked questions
Can I keep resetting a Worcester Bosch boiler with 227?+
No. If 227 returns after one standard user reset, stop there and arrange a qualified engineer if the manual gives no safe next step.
Is 227 something I can repair myself?+
Boiler faults should be treated cautiously. Stay within the user checks in the manual, and leave gas, combustion, and internal boiler repairs to a qualified professional.