20 Most Recent Honeywell Programmable Thermostat Heater - Page 9 Questions & Answers

Please share a product number and we will look into codes further for you.

If it is a two wire thermostat there shpuld be 24volts across the leads. If it is heat only this is what tuns on the unit.

most of these act up when the battery inside starts to become too weak to hold the memory.. put a new battery in it and reset it..

System is comparable to a Mode button. Press the left button once and the left button becomes System and middle button becomes Fan. Repeatedly pressing the System button will scroll through your choices. I cannot attach the owners manual. Here is the web address that I got it from: http://www.manualowl.com/swfviewer/viewer.php?CursorToolsVisible=true&FitPageOnLoad=false&SwfFile=%2Fmanualswf%2Ephp%3Fid%3D134114%26manual%5Ftype%3Dproduct%26d%3D71c664def9559052f984a338dab72b2b&ViewModeToolsVisible=true&FitWidthOnLoad=true&Scale=0%2E6&ZoomToolsVisible=true&ZoomTransition=easeOut&localeChain=en%5FUS&FullScreenAsMaxWindow=true&SearchToolsVisible=true&ZoomTime=0%2E5&NavToolsVisible=true&ProgressiveLoading=true&ZoomInterval=0%2E1

It sounds like the thermostat is malfunctioning; the Set should not be flashing at all, only the Hld should show after pushing the hold button. Do you have a new battery in the unit? Is it set to Heat or Cool? Is it already programmed for current Time/Date and does it have a schedule programmed in already? If you've lost the user manual it's here: https://customer.honeywell.com/resources/Techlit/TechLitDocuments/69-0000s/69-1431.pdf

yourhome.honeywell.com/home/.../FindOwnersManual.aspx

https://honeywell.com/Pages/contact-us.aspx

is there a jumper between RC and RH. you may have wired the red wire to RH and may be missing the jumper to RC

Hi,
Okay it seems that for some reason the battery change scrambled the brain of the t-stat... that happens...
To fix it you will now have to go into the "Installer Menu" and reset the paramenters of the t-stat.
If you have the Installe brochure then you can look in there and then set the tistat for "heat/cool" and also to "auto fan" and then to "auto changeover" These should get you back to cooling again...
No big problem, just a small programming issue...be patient and if you do not have you book don't worry... you can look it up here...this tip tells you where and how to find any of the Honeywell t-stat manuals.

Manual Honeywell How to Find Honeywell Manuals
http://www.fixya.com/support/r3894275-manual_honeywell_find_honeywell_manuals

heatman101

If your house is getting down to 64 and set at 66 then I would consider changing it. Is the stat old?