I have 11 Honeywell TH8000 series stats. All purchased and installed at the same time, 1 year ago. Only one of them offers the "auto" option under "SYSTEM" How can I get the rest to offer me this option. I searched the Owner's Guide but can find nothing other than description.

I have a Honeywell TH8000 Series Programmable Thermostat. The temperature is well below what the permanent hold temperature is set. It clicks like it's going to kick on, but where it normally says "heat on" it shows "wait". What would cause this, and how do I get it to come on? Thanks.

I have a th8000 that is locked up. I have tried new batterys I have also tried to pull the memory battery out and still nuthin I bought this house about 6 months ago and it came with it, is there any way of getting it unlocked, these aren't cheap units if not ill go with something else, also does...

The TH8000 thermostat controls a Unitary Products Group heat pump, and Nordhyne furnace. Everything is working fine... we think. BUT, why does the heat pump run when outside air temperatures are below zero degrees F? Should we be using a different System Setting on the TH8000 when OAT falls below...

This thermostat was installed only 8 months ago and has worked fine until last night. It began a humming sound and the thermostate vibrates. What is causing this? The heater is working fine and all displays are normal. It is just this loud sound that is emitting from the thermostate itself and...