BoilerFaultCodesYour boiler's internal computer has suffered an electrical failure and is no longer able to control the heating process.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: PCB Fault. Replace PCB.
What causes this fault?
This fault occurs when the boiler's main control board suffers a critical electronic failure, often caused by age or wear to the sensitive electrical components. It can also be triggered by a sudden power surge or moisture ingress that short-circuits the delicate pathways on the circuit board.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like Red LED: Flash, Green LED 1: On, Green LED 2: On — no call-out fees, no surprises.
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Potterton Promax 15/2 HE Plus is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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