Recurring pressure loss
If you repeatedly have to re-pressurise the system, there may be a leak or component problem. Repeated topping-up is not a substitute for finding the cause.
Intermittent heating or hot water
Heating that cuts in and out, takes unusually long to warm up, or produces inconsistent hot water may point to a boiler, control or wider system issue.
Unusual noises
New banging, rattling, whistling or vibrating noises are worth investigating, particularly if they appear alongside poor performance.
Repeated lockouts or fault codes
A reset may restore operation temporarily, but repeated lockouts normally indicate an underlying fault that should be diagnosed.
Safety: If you suspect a gas leak, carbon-monoxide problem or other immediate safety issue, do not continue using the appliance. Follow the appropriate emergency advice and seek competent assistance.
