F15
FAULT CODE
Ideal
PCB Communication Fault
High Severity
Engineer Required
The printed circuit board (PCB) has an internal communication error. Key boiler components cannot communicate correctly.
Step-by-Step Fix Guide
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Step 1
Try switching the boiler off at the spur, wait 30 seconds, and switch back on
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Step 2
If the fault persists, the PCB may need reprogramming or replacing
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Step 3 Engineer only
A Gas Safe engineer will need to diagnose the PCB
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.