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I have a problem with my boiler, a Rayburn 480ag (gas fired), which is short cycling. From cold it will burn continuously for 10 to 15 minutes until the boiler thermostat turns it off. It is off for just 30 seconds before firing up again, running for 30 secs, turning off again, etc, etc. It may...

I have Drayton ZA5 zone valves for hot water and central heating in the house that we have just moved to. Things are not right because the boiler is cycling every minute. Measuring flow and return temperatures indicates that the problem is insufficent flow through the system. The plumber who...