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I did it and panel went to 000. Looks like may be progress. I'll fool around with it. Thanks

I think my wife, who is out, did that, though there's no recessed area visible. I have uploaded manual in case that helps. Thanks again

Matt thanks. However, the (thermo)stat isn't working, there's no clicking. I think it's a fully pumped system - but the thermostat shows zeros and is otherwise lifeless.

My Hortsmann DRT2 digital thermostat fails to respond to commands so our heating is off (batteries are new and showing as active). Any suggestions please?