BoilerFaultCodesYour boiler's internal computer has encountered a software or setting error and can no longer communicate correctly with the system.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Control unit fault. Parameter error.
What causes this fault?
This fault occurs when the boiler's internal memory experiences a corruption or a mismatch in its configuration settings. The most common reason is a physical failure of the main control board or the small electronic 'coding card' that tells the boiler which specific model it is.
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 E10 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Viessmann Vitodens 100 Compact 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.