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The diagram is accurate i have triple checked it. There are no thermostats to turn the pump on or off, it has to be switched on and off manually, so if the fire goes out the pump is sometimes left on if no one is in. The feed in to the vent is literally straight from the tank to the vent...

HI, Below is a image of my central heating system. It is a back boiler on a solid fuel rayburn (very old system). I recentrly replaced the pump as it had just about packed in, The problems we are having since replacing the pump is that if the pump is turned on when the rayburn is not lit water...