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Hi thanks for your quick responses I went and got a honeywell style super basic 3 wire analogue dial one I have a multimeter so i guess i'll test for an output Between now and then if any other ideas come to mind - by all means fire away !

Worcester heatslave 15/19 (est 20 yr old) Not responding to stat requests - otherwise working in all other respects new stat tested, has worked for a time, then stops responding so intermittent issue Adjusting the heating level dial will still fire it up & it will finish its run till up to...