BoilerFaultCodesYour boiler's computer memory has encountered a software error and cannot confirm its safety settings.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Internal control box failure (parameters): check parameters and reset.
What causes this fault?
This fault occurs when the boiler's internal computer suffers a communication failure with its memory chip, meaning it can no longer verify its critical safety settings. The most common reason is an electrical glitch or component degradation on the main circuit board that corrupts the saved software parameters. Because the boiler cannot confirm it is operating within safe limits, it automatically shuts down for safety reasons.
DIY fix possible
Press the Reset button on the control panel for three seconds.Wait for the boiler to complete its restart sequence.If the code persists, the boiler requires a professional technician to re-configure the internal settings.
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A boiler cover plan would cover faults like E33 — no call-out fees, no surprises.
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