Honeywell TH9421 Manual

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Hello! Why The Eim(th5421) W1(o/b) Termianl Can Not 24v In Heat Mode? Thanks
WHy  the eim(th5421) w1(o/b) termianl  can not 24v in heat mode?

I Have This Thermostat That Was Installed New August 2008. It Controls Air Sou

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