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Sime Murelle HE300 not getting to temperature

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Barrie Cairnsmore

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Hi, have a Sime Murelle HE30 boiler on traditional CH 15 rads plus hot water tank circuit. Boiler gets to about 60 then modulates, drops to 50 ish but fails to reach demand temp of 75. Pressure is ok (although could do with a bigger expansion vessel). It was fine last week! Any ideas?
 

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