My own boiler at home has developed an intermittent fault causing an ignition lock out every week or two when there is a demand for hot water. When reset the boiler runs without issue for a week or two. This fault only occurs on HW demand, there has never been a lock out on CH demand. Ideal tech support can only advise carrying out a full strip down service, ensuring gas pressures are ok ( which I've done twice) . Any advice would be appreciated. Thanks in advance.