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Thanks Tony but this extract from the manual states different from what you say. Therefore could that be the problem " The immersion heaters used are 14” 3kW low watts density units with incaloy 825 immersion sheaths, and matching 11” rod thermostats which should be set to 77C. They...

I have a Pulsacoil 3. The pump was pulsing for prolonged periods even when not running the hot tap so I changed both the DHW wet sensor and the PHE dry sensor. Now when I run a hot tap the pump starts for approx. 5 seconds then switches off. If I close then reopen the tap the same happens. If...