BoilerFaultCodesYour boiler has encountered a internal software error where it has failed to verify its own settings and operation parameters.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Parameter check
What causes this fault?
This fault occurs when the boiler's internal memory experiences a communication failure or data corruption between the main control board and its identity chip. It means the boiler can no longer confirm its own safety and performance settings, often caused by a failing electronic component or a loose internal connection. Most commonly, this is due to the printed circuit board (PCB) reaching the end of its functional life or a fault with the specific plug that holds the unit's configuration.
DIY fix possible
Press the 'Reset' button on the front control panel for 3 secondsSwitch off the electrical supply to the boiler for 60 secondsTurn the power back on and wait for the boiler to re-initialise
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 e44 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Remeha Avanta 18V 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.