Glow worm shower water hot then cold then hot

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21 Aug 2005
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We have had a Glow worm Swift flow 100 combi for 6 years. For the past 6 months the hot water in the shower has been cutting out after a minute then briefly returns only to cut out again, and so on. The flow does not change - just the temperature. We also have longstanding problems with loss of pressure but we just top the system up as required. Advice on the first problem would be gratefully recieved.
 
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It's sludge/scale blocking the heat exchanger(s), almost certainly. Can be cleaned by a boiler engineer. Frequent toppng up means fresh oxygen which makes more grot from the metals etc in the system.
 

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