Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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Th8000 does not match another thermometer inside home

Am having to set heat at 74 degrees to stay warm. I have bought another thermometer to place in the same room and it reads about 4 to 5 degrees lower than the th 8000.

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Is the thermostat mounted near a lamp or other heat source?
Is the wall warm from ducts in the wall or a refrigerator on the other side?
The thermostats are usually pretty accurate. Most times I find some other influence on the thermostat causes the problem.
The Honeywell 8000 series also has a feature accessed through the installer setup menu, that will allow the temp display to be changed + or - 8 or 9 degrees.
Check the manual or Honeywell's website for a .pdf if you need it.
Hope this helps.
Matt

Posted on Jan 12, 2009

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How do I change the temperature and make it stay. I set it at 72o and it still jumps back to 75o


Is it it 75 degrees in the room? Does the heater operate when set above 75? Does it try to heat when set to a lower temp? If the heater does what it should to heat, it is simply reverting to thermometer mode. This is normal.

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I have a goodman gmp 125-5 furnace. the furnace turns on, but will not stay on long enough to match the thermostat reading. for example, if i set my thermostat at 70 and the temperature inside the house...


Depending on what type of thermostat you have there are two possible adjustments there that may help you. Remove the cover from the t-stat and see if it has a mercury switch,It will be a small glass vial with a set of contact wires inside with a small amount of mercury inside. When the t-stat calls for heat the vial which is connected to a bi-metallic coil spring will move slightly which will close the electrical contacts with the mercury. Check to make sure that the t-stat is level because if it is not then the switch won't close when it should. If you need to adjust it there are screws that two are in a small slot which will allow you to move the t-stat a little to make it level. Once it's level tighten screws while holding it level.
Also if your t-stat has a heat anticapator you can adjust it for a longer run time. All this is is a small round metal disc with a indicator and numbers around the outside of the dial.If yours has this then look on the gas valve for a amp rating and set the anticapator to match it.If you adjust it hold on to the disc to keep it from moving while you move pointer.If you have the manual for your furnace the rating for the gas valve will be in there to. If you can't find either the anticapator will be marked as to which way to turn it for longer or shorter .Hope this helps you. Also it is not uncommon for the setting on the thermostat and a thermometer to be 3-5 degrees difference. Thank you.

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3 Answers

Where do I set thermostat when temp is 10 degrees outside?


Setting a thermostat has nothing to do with outdoor temperature, but more to do with what is a comfortable setting for you and your utility bill.

A common misconception associated with thermostats is that a furnace works harder than normal to warm the space back to a comfortable temperature after the thermostat has been set back, resulting in little or no savings. This misconception has been dispelled by years of research and numerous studies. The fuel required to reheat a building to a comfortable temperature is roughly equal to the fuel saved as the building drops to the lower temperature. You save fuel between the time that the temperature stabilizes at the lower level and the next time heat is needed. So, the longer your house remains at the lower temperature, the more energy you save.

Another misconception is that the higher you raise a thermostat, the more heat the furnace will put out, or that the house will warm up faster if the thermostat is raised higher. Furnaces put out the same amount of heat no matter how high the thermostat is set; the variable is how long it must stay on to reach the set temperature.

In the winter, significant savings can be obtained by manually or automatically reducing your thermostat's temperature setting for as little as four hours per day. These savings can be attributed to a building's heat loss in the winter, which depends greatly on the difference between the inside and outside temperatures. For example, if you set the temperature back on your thermostat for an entire night, your energy savings will be substantial. By turning your thermostat back 10 to 15 degrees for 8 hours, you can save about 5 to 15 percent a year on your heating bill -- a savings of as much as 1 percent for each degree if the setback period is eight hours long.
Hope this helps..........

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1 Answer

Mystery message "wait" appears above "following schedule" display line on our Th8000. Ac does not come on even when temperature is in range. Fan operates ok. Is "wait" setting one I can reset? Maybe a...


Mystery message "wait" appears above "following schedule" display line on our Th8000. Ac does not come on even when temperature is in range. Fan operates ok. Is "wait" setting one I can reset? Maybe a compressor issue rather than thermostat? Thanks

Jun 21, 2010 | Honeywell Electronic Programmable...

2 Answers

AC Thermostat is set to 78 but wont cool past 79 or 80


If your unit is running 24/7 you are either low on charge or the unit is to small for your house.
A 20° temperature difference is about normal for the room air vs the air coming out of the ducts, but the room air and the leaving air should keep getting colder and colder.
An air conditioner should cycle approximately 3 maybe 4 times in an hour if it's properly sized.
As for the thermostat thermometer they are very cheap and are more for reference than actual temperature, so if 78° is not comfortable, then you should set it lower but not rely on thermostat being accurate or what the thermometer is saying as long as it is consistent.
The air conditioner and thermostat can also be set below 78°, there's a lot of people set them at 72° and below with no problems.
the only thing is if you have real low humidity you'll need to watch indoor coil or the suction line (the big line) on your outdoor unit and make sure it doesn't freeze up on you.

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Our TH8000 Series Programmable Thermostat keeps flashing "change filter" even after we changed it. The guide book does not show how to re-set so the flashing stops.


try holding the filter button in for three seconds, if that doesn't reset the timer try the filter button and the temp. up button at the same time for three seconds.

Mar 30, 2008 | Honeywell Electronic Programmable...

1 Answer

Rinnai unit


OK, sounds like a sensor problem to me. The temperature reading is done on the backside of this unit. Remove the top cover and with a flashlight in hand, look for a small black rubber probe with yellow wires attached. You will find it about 2 inches above the floor and on the right hand side (when viewing from the front). Make sure this probe is not being influenced by the venting system and showing a “false” reading. If the vent pipe (the one covered by cloth) is close to it, the probe is made that you can relocate it out of the way of the vent. You will need to get to both the backside of the heater and go inside the heater cabinet to do this properly. If the vent is a few inches away and not influencing the probe, place a cold cloth on the probe and see if the temperature drops. Then a warm clothe on it to see if it rises. You could have a bad probe. List your model number and I can get you a part number.

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