Digital Thermostat Conversion, no display
I have a 20 year old honeywell dial thermostat with 4 wires, Red Green White and Yellow connected.
I purchased a Honeywell T8001F programmable and connected the RED wire to the R connection, White to W, Yellow to Y and Green to G.
There are other wire terminals like B and O .
Once connected the unit is dead, no display and acts as if there is no power. I have voltage coming in ut am wondering if it's enough to drive the unit. This particular unit does not use batteries.
A schematic would be excellent! Honeywells installtion instructions and diagnostics are horrible and I'm hoping you folks can help.
Have a great day all.