LCD display on thermostat is blank

Problems related to residential installations.

LCD display on thermostat is blank

Postby WinstonRiley » Fri Dec 09, 2011 12:29 am

Hi. I'm hoping one of the HVAC experts can help. I've got a gas furnace and today I bought a new thermostat after the old one seemed to go bad. It is digital and had show low batteries. When I replaced it with new batteries, the display was blank.

So when I bought the new thermostat (low voltage manual type) I've tried to replace the wires by color to the appropriate W, B, G, and R places. There is no R screw, only the RH and RC. I think it was a mistake to put the b on the b screw. The little booklet shows the b screw empty.

Any help?
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- LCD display on thermostat is blank

Postby heatseeker » Fri Dec 09, 2011 9:38 am

What do you mean? You put the blue wire on the b screw? If you did it would not do anything unless that wire was connected to common at the furnace. Did you turn off the power to the unit when replacing the t-stat. If not you could have blown the low voltage fuse or burned the t-former. At any rate stop messing with it before you screw it up.
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