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Hi Can somebody explain the function of the thermistor on the unvented cylinder on this model and what symptoms would be seen if this fell out or had failed? many thanks!

Hi System installed in new build flat 2 years ago. 6 months ago it had a problem causing a lot of water to go out through the tundish - this was fixed. For the past few days I've been woken in the early hours of the morning by a loud water 'gurgling' noise from the boiler. It was making this...