BoilerFaultCodesYour boiler's internal computer has suffered a software failure and can no longer process the settings needed to operate safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Default parameters. Automation settings. Replace boiler control unit.
What causes this fault?
This fault occurs when the boiler's internal memory becomes corrupted and loses the essential factory settings required to run. The most common reason is an electrical surge or a terminal component failure on the control board that prevents the computer from reading its own software.
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 e45 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Remeha Avanta 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.
Affiliate links — we may earn a commission at no extra cost to you.