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That would make a lot of sense. Thanks very much for explaining that. I will order a new thermostat rod for the bottom heater and give that a whirl. In the meantime, as my timer is set to heat the water at night time, and I very rarely use the boost, is it possible to swap the new rod (from...

Also, when you mention that I should ensure the store is properly filled with water, is there a simple way to check that the correct level of water is in the store? I have ensure there is plenty of water in the top extension tank. Thanks

Thanks for the reply. The 11" thermostat rod I replaced was located in the highlighted area below (not my actual picture, just one i found from google) : Sorry for the very poor questions, but when you say there are two heaters, each with their own thermostat/sensor, could you please let...

Thanks for the reply Tony. My brother has had a quick look at it (apprentice gas engineer), who has fitted the new rod and sensor. In his defence he's never worked with a pulsacoil 3 before and he's still studying so I couldn't expect him to know everything just yet :D. We changed the...

Hi there. Really hoping you can help... I own a pulsacoil 3 water heater, which is overheating every night, causing the overheat button to pop out. I am having to push the button back in every night in order for it to heat up again. I have had the domestic hot water temperature sensor and...