20 Most Recent Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater - Page 2 Questions & Answers

So the indoor fan is running and blowing air inside but it is not cold?? Is the outdoor fan running ? If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

If you have a float switch on your drain line and the drain is backing up this will cut power to the tstat. Drain slowly drains, float switch resets, power comes back to tstat. That's my educated guess. But, is there batteries in the tstat? If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

i just called customer service for the same problem. Push the fan button, which is the MIDDLE BUTTON of the 3 bottom buttons, and the UP ARROW button at the same time, you will see the number 1 on the left of the screen. Press the bottom right button until you see the number 28 on the left, 68 should be on the right. Press the DOWN ARROW until you get to the desired temp, it won't go lower than 50. Then press ok.

Yes, be very very concerned. Get help. Don't use heater.

Sounds like the tstat, obviously, isn't responding. A sure check is to bypass the tstat. Turn power off to airhandler and remove cover. Remove red, green and yellow wires and wire nut/ twist together. Turn machine on and see what you get. If inside and outside turns on...bad tstat OR just not setup properly. EVEN THE PROFESSIONALS READ THE INSTRUCTIONS THESE DAYS!! If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

Joss sounds like the anticipator setting on thermostat i would replace it with a digital it will be more actturat . The furnace has to go over temp setting to turn off

In all likelihood the thermostat has failed. Replace it.

I would say that you have one of two issues. Either your thermostat is bad or you do not have 24v coming from the heating unit. In this case the problem would be in the low voltage circuit of the heater. At the heater you should have 24v AC when you place an electric meter across the R terminal and the C or W terminal. If you have no vaoltage across the R to either the C or W then you have a bad transformer or a blown fuse in the furnace. If you do have voltage ther and also at the t-stat then the t-stat has gone bad, replace it.

it means that it is friday and your "return home" program is running. there isn't actually a "FR Return" alert, it just lines up that way because the day of the week line sits directly above the program line.

Wired wrong

When the snowflake is blinking it usually indicates something is wrong with your AC. The first thing you should do is to verify that the power is there and don't forget the switch to the blower next to the furnance.

Then see if the exterior fan is working/spinning. If it isn't, then it could be the contactor-relay or the capacitor or the compressor. I always recommend that the contactor-relay and capacitor be replaced at the same time because they have similar failure rates and if you replace one now, the other might fail shortly later, but use your best judgement. They aren't that hard to replace, but make sure the power is off before you do it.

You can find the contactor-relay and capacitor from this site: http://www.hvacpartsoutlet.com/Goodman-45/5-mfd-370-Volt-Round-Dual-Run-Capacitor-CPDRG455.aspx and if you aren't sure which one to order ask the site and they will help you.

Now if the compressor is bad, which you can check with an ohm meter, then you will need a professional to change it since there is freon to be captured and then to charge the system.

Strip the unit and remove the circuit board (just a few plastic clips, no screws). Remove the LCD assembly from the circuit board (more plastic clips and an eight pin push connection). Removed the LCD unit from the clear plastic housing (more plastic clips). Finally heat up the plastic ribbon where it is stuck to the circuit board (hair dryer will do trick) and then firmly press it onto the circuit board... probably worth doing this several times; in effect you are remating the ribbon to the circuit board by softening the adhesive. Put it all back together and it should be working again.

Just reset everything,it sounds like your t-stat is defective

Hi move the thermostat the sun is making the ac cut in

by the outside unit, you will have a shutoff. pull out the shutoff, and unscrew the cover. 2 cylinder like fuses are inside. It is likely that one or both are bad. When you turn on the AC and the outside fan does not turn on... this is likely this is the solution.

Google Honeywell Tecnical Service. You should find a 1-800 number that will direct you to a technician for residential applications. He will walk you through each step required. Have the model # of your thermostat ready for him

Yes it will reset itself when you do that, it really should not be too hard to figure out the day.

You are asking a question that makes no sense mechanically, if you mean the fan, it is controlled by the temperature delay or a time delay built into the furnace.

http://www.gogeisel.com/geiselonline/support/Honeywell/CT3300_CT3355.pdf this is the programming manual- they have a note that if you show low battery after replacing the battery- put the battery in backwards, wait 10 seconds, then put the battery in correctly again to reset it- you will have to reprogram the clock time and date and any settings you had previously.