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How do I change the temperature range on a Honeywell TH8110u1003 thermostat. The range now won't let me go below 77 in AC mode.

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Try adjusting the heat range up. Set it a 77 then try the cool.
I believe the Honeywells have a max range between cool and heat.
also sometimes there is a lock out code on them you'll need the book.
Good luck

Posted on May 20, 2008

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What is the on/off temperature (heat) range for a RTH111 series


Heat range: 40 to 90 degrees F
Cool range: 50 to 99 degrees F
1 degree deadband

Here's the operation guide:
https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-2603EF.pdf

Please mark my answer as helpful.

Jan 05, 2015 | Honeywell Digital Manual Heat/Cool...

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Honeywell th8110u1003


The Honeywell TH8110U1003 thermostat is a universal programmable thermostat that gives you electronic control of 24V AC heating and cooling systems. It also has the capability to be used on 750mV heating systems


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One of the best features of this thermostat is it’s big clear backlit display. The current temperature, the set temperature and the date/time of day are displayed at all times. Simply touching the screen also activates the back light feature.

This digital thermostat has a menu programming guide the helps you through the process of setting up your schedule. You are able to select multiple days and customize the thermostat for any kind of unique schedule you may have. This thermostat also let’s you take it off the wall and still be able to program it. This lets you watch TV and program it at the same time.

There are built in backups that will hold the time for you if the power goes out. This t-stat will also update for daylight savings time. There are HOLD features that allow you to modify your program and hold it and then go back to the original.

Change reminders that are built in include the air filter, UV light, humidifier service and of course the batteries of the thermostat. The blower of you furnace can also be programmed to run extra to help increase the air quality in your home.

If you decide you want to know the outdoor temperature you can purchase an additional sensor and then hook it to you thermostat. The outdoor temperature will then be displayed on you thermostat. This feature also gives you the capability of using the sensor to monitor indoor temperatures remotely.

This thermostat will keep you very comfortable as the variation typically in temperature from set point is less than 1 degree F. The thermostat after a period of time learns the characterizes of the way the house or building heats and cools and then adjusts to get the most efficient operation of the heating or cooling system while maintaining a very close temperature tolerance.

By changing a few of the parameters in the thermostat this can be can be configured for either single stage conventional heat/cool systems or any single stage heat pump system.

http://www.fixya.com/support/r3623083-thermostat_wiring_terminal_designations

http://www.fixya.com/support/r3869033-replacing_thermostat

http://www.fixya.com/support/r3894275-manual_honeywell_find_honeywell_manuals

http://www.fixya.com/support/r3892721-programmable_honeywell

on Jan 17, 2010 | Air Conditioners

1 Answer

How do i adjust AC temperature variance on a Honeywell TH5220D1003 thermostat


If you are talking about the difference between heating mode and cooling mode and the room setpoint, you can not change it. It comes from the factory with a 3 degree difference. In other words if you raise the heat setpoint until it is within 3 degrees of the cooling setpoint, for every degree you raise the heat setpoint the cooling will raise a degree.
About all you can do is increase the distance between the heat and cooling setpoint. To do this either lower the cooling setpoint to 3 degrees higher than the heat setpoint you want and then increase the cooling setpoint the desired setting. For example heat and cool setpoints are 67 and 70 respectively, and you want 65 and 73. Lower the cooling setpoint to 68 and then raise the cooling setpoint to 73. Now your heating will come on 3 degress lower than 68, the 65 you wanted and cooling will come on at 73. Remember, the thermostat new setpoints will turn on the cooling at 75 and turn back off at 73 and heat will turn on at 63 and turn off at 65.
You can perform the same using the heating setpoint, just have to look at it backwards. If you need to lower the difference I recommend a 8000 series thermostat. They are the most functional thermostat that Honeywell makes, be in mind they are about 3 times more expensive and many of the setting require a well trained tech to interpret and set properly.
Hope this helps.

Aug 24, 2014 | Honeywell Th5220d1003 Non-programmable...

1 Answer

TH8110U1003 Touch screen thermostats. My problem is I don't have a manual to show me how to operate it. But the big problem I'm dealing with now is when I set a temp. say I set it for 75 and the house...


If your program that you have programed into the stat is set to 73 it will go back to that setting if the stat is in the program mode....... Push the HOLD button on the stat and keep pushing it till it say permanent HOLD right above the buttons on the bottom and then you can set your temp to what you want. Here is a download link for the manual from Honeywell..
http://customer.honeywell.com/techlit/pdf/PackedLit/69-1894EFS.pdf

Mar 22, 2011 | Honeywell Air Conditioners

1 Answer

How do I install a honeywell thermostat TH8110U1003


* Click Here for the Owners Manual
* Click Here Installation Instructions

Hope this helps to solve it; good luck.

Mar 16, 2011 | Honeywell Air Conditioners

1 Answer

Improper Termperature Readings during AC run


personally i'd just replace the thermostat, but try pulling the front panel off and look on the circuit board and see if there is a jumper for F/C or any other settings. you may try changing its position. you can also remove the batteries for 15 minutes and see if it resets itself. the only other thing it could be is a wiring issue.

May 29, 2009 | Air Conditioners

1 Answer

How to program Honeywell thermostat for remote sensor


Remote Sensor (Setup Function 0340): If an optional outdoor sensor is installed, the thermostat can display the outside temperature. If an optional remote indoor sensor is installed, the thermostat will display the temperature at the sensor location (the internal sensor in the thermostat is not used).
\ 0 No remote sensor
1 Outdoor sensor (display only)
2 Outdoor control sensor (select heat pumps

Dec 31, 2008 | Honeywell Air Conditioners

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