I would like to know how to test a digital thermostat (new Honeywell programmable) with a multimeter at the furnace control board The control board is Honeywell TotalZone.
I have standard mult-meter and need to know where to put the leads and what settings. Also, is this signal in millivolts DC and what range?
So, when the thermostat should be calling for heat, what should the multi-meter read at the control board?
Thanks in advance,