BoilerFaultCodesYour boiler has paused because the reset button was pressed briefly and simply needs another press to confirm and restart.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: Reset button pressed by mistake. Press reset button again.
What causes this fault?
This fault occurs when the reset button has been tapped or pressed momentarily without being held long enough to complete a full reset cycle. The boiler enters a 'waiting' state because it has detected an accidental or incomplete command and requires a second press to confirm you actually want it to restart. It is essentially a safety buffer to prevent the system from rebooting unnecessarily due to a brief knock or touch.
DIY fix possible
Locate the reset button on the control panelPress and release the reset button once moreWait a few moments for the boiler to complete its restart sequence
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 H9 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Worcester Bosch Highflow 400 BF 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.