BoilerFaultCodesWhat the manual says
Manufacturer manualPCB Fault: Replace PCB
From this model's manual
Verified against the Ideal Logic Max System installation & service manual, page 75.
What causes this fault?
This fault occurs when the boiler's main control board experiences a critical electronics failure or a memory corruption error. The most common reason is natural wear and tear of the electrical components over time, or damage caused by an external power surge or moisture ingress.
While this fault can happen year-round, it is slightly more common during winter storms when power outages and electrical surges are more frequent.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register →
Boiler cover options
Avoid the next call-out bill
A cover plan would handle faults like F09: no call-out fees, no surprise bills.
Approved partner
Get a quote →
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Affiliate links. We may earn a commission at no extra cost to you.