2948 B
FAULT CODE
Worcester Bosch
No Flame Signal (8000 Series)
Medium Severity
Engineer Required
On Greenstar 8000 boilers, code 2948 B indicates no flame signal was detected. At low output the burner restarts automatically after cleaning. If occurring repeatedly, the CO2 valve settings need checking.
Step-by-Step Fix Guide
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Step 1
Allow the boiler to attempt auto-restart
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Step 2 Engineer only
If the fault persists, a Gas Safe engineer should check the CO2 valve settings and ignition system
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.