BoilerFaultCodesYour boiler has developed a communication or hardware circuit error that has caused it to stop providing both heating and hot water.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Boiler is not working for central heating or hot water and the display shows ‘HHHHH:::::AAAAA ’ (flashing).
What causes this fault?
This fault occurs when the boiler's internal communication system suffers a total breakdown, essentially meaning the different electronic parts can no longer 'talk' to each other. The most common reason is a physical failure within the main circuit board or a malfunction in the control knobs that prevents the boiler from receiving instructions. Because the brain of the boiler cannot verify the system is safe or functional, it shuts down entirely as a precaution.
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 HA — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Ideal Elise H 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.