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Intermittent hot water problem wb combi

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pete green

WB combi has recently had it's annual service. It has been working reliably up to that point for many years.
Now we keep losing hot water - temps on boiler increase over 100 on the display and it shuts down heat.
Engineer claims it's coincidental and must be a blocked heat exchanger that has nothing to do with the service.

Is this plausible or is there something else to look for ?
 
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