BoilerFaultCodesYour boiler’s internal computer has been given instructions that it doesn't recognize or that don't match how the unit is physically built.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Boiler does not support the parameters set for the hydraulic configuration
What causes this fault?
This fault occurs when the boiler's control board is programmed with settings that do not match its physical internal components, specifically regarding how water flows through the unit. It typically happens after a major repair or a software update where the incorrect 'code plug' or configuration profile has been selected by a technician. Essentially, the boiler has become confused and has shut down as a safety precaution because it doesn't know how to operate its pumps or valves correctly.
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 2955 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
Affiliate links — we may earn a commission at no extra cost to you.