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Well, Smart Products stepped up to the plate and solved the problem! Thanks Pierre. The issue was: I did not have the latest instructions and the wiring diagram. The key is (in my instance) to join White & White/Black wires together and connect to White off the wall (Heat) as well as Green &...

Hello Jerry, Here is the file for the Honeywell T8401C thermostat (with 5 wires) that was installed originally: http://customer.honeywell.com/Techlit/Pdf/...00s/69-1494.pdf I also have the ZTT000 file which is larger than allowed so if anybody is interested, I can email to you. Thanks guys for...

Jerry...the original thermostat wire colors were Red, Blue, Yellow, White & Green. And, yep, the fuse was blown on the transformer. The revised document is no longer showing up at the URL. It is showing the old manual with the old wiring diagram which did not work. According to Honeywell, Red &...

Could anybody tell me if they had experience with 5-wire, single heat/cool system and if the wiring match-up I mentioned in my earlier post is in fact correct. My feeling is that the thermostat is not functioning properly. If the thermostat is showing a current temp of 70 and the heat set point...

Thanks for both responses, really appreciate it. I don't think the problem is with the wiring as it did heat at one point (when it was set to "auto"). The set point being close: that may be the problem. However, now I have a totally different problem...tried to install the old thermostat and I...

:D I have been fighting with the ZTT000 for almost a week now and finally took it out! First, it was the wiring...the instructions showed one thing, until finally found a NEW set of instructions which showed something totally different. I have a simple central A/C system with electric heat. The...