BoilerFaultCodesYour boiler is confused by how long it is taking to heat your hot water and is stuck in a constant cycle.
This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.
Technical description: Constant hot water cycle time
What causes this fault?
This fault occurs when the boiler detects that it is taking far too long to reach the required temperature for your hot water, causing it to get stuck in a repetitive heating loop. It is usually caused by a faulty sensor sending incorrect temperature readings to the brain of the boiler or a mechanical part failing to direct heat to the water properly. In some cases, the main control board may simply be misinterpreting the data it receives from the system.
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 6.8 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Worcester Bosch Greenstar 25 HE Combi 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.