HELP: Honeywell progamable thermostat

You didn't mention what the actual room temperature was at 3 AM when the furnace was running. I suspect that either the temp was quite a bit below 68 deg. or your heating system takes a very long time to substantially raise the temp in your home. These thermostats have a factory set default to "adaptive" mode which senses both the time of day and the difference between the actual room temperature and the temperature that is set for the next programmed interval. The goal is to have the room at the desired temperature at the time the next programmed interval starts (not to begin warming or cooling at that time). Over the course of about 5 days, the thermostat "learns" how much time is required to get to the next set point and adjusts the start time accordingly. Let it do it's thing and you will probably note that the start time gets later and later until eventually your room is at 68 deg. at almost exactly 6:30AM.

My Honeywell also shows the temperature of the next programmed interval when the heat or A/C kicks in to start getting the temp to the desired next set point. It's not a malfunction.

P.S. On my thermostat, there is an adjustment screw on the back that lets you over-ride the "adaptive" mode and have the thermostat work in the traditional timed mode - which starts the heating or cooling cycle at the programmed time.

Hi, What is the model? It has wake, leave, return, sleep; 4 settings. Your case needs only 3 settings bypassing leave. Jot down program to do on a piece of paper and do it. I use Visio Pro 8000 and it does anything I want. Just a matter of (armchair)programming. Maybe I am biased as an ex-Honeyweller.(retired in '96 when times were good after 30 odd years)

Thanks for the info, Peter.

The temp at 3 am was about 66 deg, only 2 deg below the temp setpoint set to start at 6:30 am. My furnace is 24 yrs old, but it is more efficient than that.

It;s probalby 10 yrs old, CT3600

Mine does not have these settings, only morning, daytime, evening, night.

Thanks for the input,

-Zz

I have one and let me make a few suggestions. If you haven't done so already carefully read the directions again. Secondly, are you hitting "run program." I had mine on HOLD instead of the "run program" button activated and I had a similar problem. Did you set all seven days? Is the time and day correct? Scan through your days and times (all 4 of them) to make sure that they are where you want them then push "run program." Did you install it or have it installed? Have you checked the Honeywell sight? good source for info.

phil

You did tell the thermostat what the current time was, right?

------------------------------------- It is possible that there is a recovery mode setting on it that is causing the issue. I know the new honeywell t-stats have that function. Not sure about your model. If you can find a copy of the installers manual it will say.Also try changing the batteries if it doesnt have a constant power. constant power meaining with a common wire and the red wire. But being 10 year you might want to replace it. Personally I am a huge honeywell fan.

------------------------------------- It is possible that there is a recovery mode setting on it that is causing the issue. I know the new honeywell t-stats have that function. Not sure about your model. If you can find a copy of the installers manual it will say.Also try changing the batteries if it doesnt have a constant power. constant power meaining with a common wire and the red wire. But being 10 year you might want to replace it. Personally I am a huge honeywell fan.

------------------------------------ if its on hold its going to maintain temperature, or it should if nothing is wrong with the equipment. but yes make sure to press the run program.

Isn't high noon 12:00 AM? And midnight 12:00PM? Maybe you should get a military thermostat with 24 hour timing to avoid confusion. That's what eBay did.

Joe

As others have said, that is likely the adaptive mode getting a run at the next setting. I've learned to live with it, and pushed my times a head slightly so it will still be pushing up when I want it to be there. My fuel bills have reduced drastically since I went to these thermostats. Sharp changes in outside temperature will make the adaptive mode rethink the whole thing and perhaps it will guess wrong for a day or 2, but overall, I save a bunch, and give up nothing in comfort. I highly recommend Honeywell.

Absolutely not!

Gordon Shumway

Our Constitution needs to be used less as a shield for the guilty and more as a sword for the victim.

As others have said, that is likely the adaptive mode getting a run at the next setting. I've learned to live with it, and pushed my times a head slightly so it will still be pushing up when I want it to be there.

The adaptive mode does not work well in areas with wide temperature swings.

By the time the system adapts the weather has changed again.

While I love the setback feature I have disabled the adaptive mode on both of our units.

I would have to look it up in the manual but it was as simple as turning a small screw on the back of the unit.

But just in case you missed the other post 12AM is midnight and 12PM is high noon.

Colbyt

I've had very good luck with Honeywell. That said, they do break after a time and they do wear out batteries. Low batteries do cause flaky things to happen. Try a new one and see what happens.

Hi, Come to think of it, 40 and 68 degs. Your temp. never goes down to 40 and furnace has to run to bring up the temp back to 68. I don't think Adaptive mode can handle your particular setting. To pove a point set it to 50 and 68 and see what happens. My Vision Pro works OK with temp swt at 17 and

21 Deg. C. After reacing 17 deg. in the night, it needs about an hour to bring it back to 21. So furnace starts running 1 hour ahead of set time. I bet you setting is near or at outside design specs.

Thanks for the responses.

I did in fact have it set up and running correctly (i.e. hit the "Run Program" button).

It must have to do with the "Smart" mode, and ramping up to the target temp for the next setting. BUT, it comes on 2-3 hours ahead, then turns off for an hour ort so, then on, then off....

I'd expect it to come on maybe 30-45 mins early, and turn off when it gets to target.

I'll fiddle with another couple days and see what gives.

-Zz

Try this-- do NOT set it at midnight, try 12:10 AM or 11:50 PM.

I had mine (also a Honeywell) set to set back at midnight... one night I woke up in the middle of the night, happened to be walking past the thermostat, and it was daytime temperature.

I set it back to 11:50 and never had that problem again.

I think that there's a bug in the software that confuses it at exactly midnight because that's a different day.

And please-- let us know what happens.

-Shaun Eli

(copyright 2010 by Shaun Eli. All rights reserved)

That's a good idea to try. Also, the way he's using the time periods is not like I have ever used them. He has the day start at 12AM. I've always had night set from like 11:30pm to 6am, morning 6am to

8am, day 8am-5pm, evening 5pm-11:30pm. I don't see why it really should matter, but he could also try using the more conventional assignment of the periods.

It's hard to imagine that is adaptive recovery causing it because he says it's kicking on 3 hours ahead of time with only a 2deg temp delta to achieve. If he said it was an hour, then I'd suspect that. If they behaved that way, even when learning, they'd have a lot of disatisfied customers. Other obvious questions:

Is the battery new? Try taking the battery out, doing a complete reset? Did it used to work properly?