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<blockquote data-quote="MarkW" data-source="post: 925748" data-attributes="member: 401878">I changed a heat exchanger on my boiler sometime ago.Going from your diagram,and my old one,the fresh cold water comes in at the rear left port and goes out hot from the rear right port and onto the taps.The hot water,from the burner, is pumped in on the front right port and out from the front left port and back to the burner via the diverter.These two circuits are completely separate.Hopefully this clears up the confusion in this area.ie the cold water in isn't connected to the output from the front left port.&nbsp; &nbsp; Not sure what could be causing your problem but if there was a restriction in the heat exchanger,as Terryl suggests,then the heat from the hot water(from the burner)wouldn't be dissipated quickly enough (through the heat exchanger)and it would overheat causing the pressure to go too high as well.If the diverter wasn't moving all the way to the hot water position then perhaps it would keep heating the radiators and wouldn't cause the temperature sat to trip....I think.My money's on the heat exchanger.The new one I got cost about £50.Good luck.cheers</blockquote>

[QUOTE="MarkW, post: 925748, member: 401878"] I changed a heat exchanger on my boiler sometime ago.Going from your diagram,and my old one,the fresh cold water comes in at the rear left port and goes out hot from the rear right port and onto the taps.The hot water,from the burner, is pumped in on the front right port and out from the front left port and back to the burner via the diverter.These two circuits are completely separate.Hopefully this clears up the confusion in this area.ie the cold water in isn't connected to the output from the front left port. Not sure what could be causing your problem but if there was a restriction in the heat exchanger,as Terryl suggests,then the heat from the hot water(from the burner)wouldn't be dissipated quickly enough (through the heat exchanger)and it would overheat causing the pressure to go too high as well.If the diverter wasn't moving all the way to the hot water position then perhaps it would keep heating the radiators and wouldn't cause the temperature sat to trip....I think.My money's on the heat exchanger.The new one I got cost about £50.Good luck.cheers [/QUOTE]

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