Worcester 240 - Hot Water Works Fine, But Central Heating Trips Out

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Worcester 240 - Hot Water Works Fine, But Central Heating Trips Out
16 April 2009, 1:48 AM

markhobley
Joined 16 Apr 2009
1 posts

I have a Worcester 240 boiler. The hot water works fine, but if I try to use the central heating, the heat does not leave the boiler (ie the output pipe stays cold), and the boiler overheats, tripping the overheat switch. When I run the hot water, I notice that there is no run on through the radiators, but when I stand next to the boiler, I can hear the pump running. It is as if the pump cannot circulate the water. I had the gas board out to this, and they have serviced the ignition system, and replaced the pump and the diverter diaphragm. They say that my pipes must be blocked, but I have a radiator right next to the boiler, and the water could flow into that one. The pipes literally just come out of the bottom of the boiler, into a tee, which on one side travels about four feet to the radiator before a return to the boiler. I opened the drain valve, and opened the water inlet to a high pressure, and water spurts out at full pressure from the drain. I doubt there is a blockage. Also, I am in a soft water area, and the pipes do not fur up here. I still suspect a fault in the boiler. Is there some sort of valve or something that may not be opening, preventing the water from circulating?
I have read lots of horror stories of people being sold power flushes but this not fixing the problem. The gas board want 500 quid from me to do a powerflush.

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Worcester 240 - Hot Water Works Fine, But Central Heating Trips Out

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