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View Full Version : Thermostat is blank and furnace won't come on

patjs1949
Dec 31, 2014, 09:31 PM
Thermostat is blank and furnace won't come on
parttime
Jan 1, 2015, 04:41 AM
Hi pat and welcome, Have you changed the batteries in the thermostat?
ma0641
Jan 2, 2015, 09:02 PM
Battery or hard wire unit? Does system use a Honeywell Smart Valve?