D1 204
FAULT CODE
Worcester Bosch
Boiler Identification Module Fault
Medium Severity
Engineer Required
The boiler's identification module (SCB) is not communicating correctly with the main PCB. Usually occurs after PCB replacement.
Step-by-Step Fix Guide
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Step 1
This is almost always a post-service fault
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Step 2 Engineer only
The engineer who last worked on the boiler should check the SCB connections
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.