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just changed an old Potterton 2000 controller for a ep 2002, as soon as you bring in the central heating it takes out the trip for that circuit. Have checked out both pumps they are working ok, checked out wiring to pumps ok. disconnected thermostat and tank stat one at a time both ok. Initially system worked for 4 days after change of controller, seems to operate hot water system with no problems. Is there anyone out there who could suggest an answer to this nightmare