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The honeywell TH811U1003 thermostat screen stays on without being able to adjust for heat or ac how to fix

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

hotuna
  • 288 Answers

SOURCE: Honeywell thermostat adjustment

The little pointer is called an anticipator, and it is just that. It anticipates how long to wait before coming back on. It has little numbers on it, hopefully you can read them. like .5 will wait 1/2 minute at that temp. before coming back on. It sounds like a high setting is what you are looking for, so a long time setting will be what you want, and if you haven't already figures it out, sliding the pointer is how to change the setting.

Posted on Feb 16, 2008

  • 80 Answers

SOURCE: honeywell chronotherm IV Plus thermostat

There are no batteries on an 8600-8601-8602 series

Posted on Sep 19, 2008

  • 252 Answers

SOURCE: Honeywell thermostat reads ''-AC'' what does this mean?

-AC means no power to thermostat from furnace.

Posted on Apr 12, 2009

  • 1 Answer

SOURCE: 44860 thermostat won't activate in heat mode

I had the same set and problem. I had a RC wire which is the power to the AC. But didn't have an RH wire which is the power for the heat. To fix this just use the jumper wire and insert it in with the RC wire and hook it up to the RH. Fixed my problem.

Posted on Oct 16, 2009

  • 587 Answers

SOURCE: I Have a honeywell RTH2410 Thermostat I wired it

What was the old thermostat labels and the wire colors that went to them?
The typical heatpump wiring Terminals are:
R = Red = Hot side of Transformer
C-B-X = Common side of transformer Depending on brand of heatpump
Y = Yellow = Cooling Contactor
G = Green = Furnace Blower
O = Orange Reversing Valve Energize to Cool
B = Blue Reversing Energise to Heat Depending on brand of heatpump.
W2 = White = Auxiliary Heat
You need to be sure where each wire comes from when you connect them to the new thermostat.
The best way to do that is to go to the furnace and see where they are connected. R-Y-G are probably correct, you need to see where the Blue wire comes from and determine what the X terminal was on the old thermostat.

Posted on Dec 29, 2009

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My Honeywell Themostat is no longer controlling the systems after a battery change, but otherwise looks fine. Help!


The replacement batteries could be defective or installed incorrectly. Also, if the thermostat has to be removed from its mounting base for installation of replacement batteries, it may have been reinstalled incorrectly.

Nov 07, 2015 | Honeywell Heat/Cool Thermostat

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The Honeywell TH811U1003 thermostat is a universal programmable thermostat that...


The Honeywell TH811U1003 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

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

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This 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.

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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.


Specifications of the Honeywell TH8110U1003 Thermostat
  • Description: VisionPRO Touchscreen 7-Day Programmable 1 Heat/1 Cool
  • Conventional and Heat Pump Thermostat
  • Application: Gas, Oil or Electric; Heat Pump; Millivolt
  • Programmability: Universal Programming from 7 Day to Non-Programmable
  • Changeover: Auto or Manual
  • Color: Premier White
  • User Interface: Touchscreen
  • Switch Positions (System): HEAT-OFF-COOL-AUTO
  • Switch Positions (Fan): AUTO-ON
  • Power Method: Battery or Hardwired
  • Terminal Designations: R, RC, C, W (O/B), Y, G, S1, S2
  • Dimensions (in.): 4 9/16 in. high x 6 in. wide x 1 1/4 in. deep
  • Mounting: Horizontal
  • Electrical Ratings: 20 to 30 Vac
  • Frequency: 60 Hz. 50 Hz
  • Setting Temperature Range (F): Heat: 40ª F to 90ª F. Cool: 50ª F to 99ª F
  • Setting Temperature Range (C): Heat: 4.5ª C to 32ª C. Cool: 10ª C to 37ª C
  • Differential Temperature (F): 1ª F
  • Differential Temperature (C): 0.5ª C
  • Stages: Up to 1 Heat/1 Cool
  • Outdoor Sensor: Yes, optional outdoor or indoor remote
  • Remote Sensor: Yes, optional outdoor or indoor remote
  • Sensor Element: Thermistor
  • Currents (Heating): 1.0 A running
  • Currents (Cooling): 1.0 A running
  • Currents (Fan): 0.6A running
  • Operating Humidity Range (% RH): 5 to 90% RH, non-condensing
  • Comments: Selectable to and Heat Only or Cool Only
  • Features: Screen lock


on Jan 15, 2010 | Hardware & Accessories

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Th811u1003


The Honeywell TH811U1003 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

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

This 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.

Normal 0 MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";} Specifications of the Honeywell TH8110U1003 Thermostat
  • Description: VisionPRO Touchscreen 7-Day Programmable 1 Heat/1 Cool
  • Conventional and Heat Pump Thermostat
  • Application: Gas, Oil or Electric; Heat Pump; Millivolt
  • Programmability: Universal Programming from 7 Day to Non-Programmable
  • Changeover: Auto or Manual
  • Color: Premier White
  • User Interface: Touchscreen
  • Switch Positions (System): HEAT-OFF-COOL-AUTO
  • Switch Positions (Fan): AUTO-ON
  • Power Method: Battery or Hardwired
  • Terminal Designations: R, RC, C, W (O/B), Y, G, S1, S2
  • Dimensions (in.): 4 9/16 in. high x 6 in. wide x 1 1/4 in. deep
  • Mounting: Horizontal
  • Electrical Ratings: 20 to 30 Vac
  • Frequency: 60 Hz. 50 Hz
  • Setting Temperature Range (F): Heat: 40ª F to 90ª F. Cool: 50ª F to 99ª F
  • Setting Temperature Range (C): Heat: 4.5ª C to 32ª C. Cool: 10ª C to 37ª C
  • Differential Temperature (F): 1ª F
  • Differential Temperature (C): 0.5ª C
  • Stages: Up to 1 Heat/1 Cool
  • Outdoor Sensor: Yes, optional outdoor or indoor remote
  • Remote Sensor: Yes, optional outdoor or indoor remote
  • Sensor Element: Thermistor
  • Currents (Heating): 1.0 A running
  • Currents (Cooling): 1.0 A running
  • Currents (Fan): 0.6A running
  • Operating Humidity Range (% RH): 5 to 90% RH, non-condensing
  • Comments: Selectable to and Heat Only or Cool Only
  • Features: Screen lock

on Jan 15, 2010 | Heating & Cooling

1 Answer

I have a honeywell thermostat t6360.the light stays on continuously whereas before it only came on when the heating was due to come on.now the heating doesnt come on at all.


Many thermostats have battery backup as well as the 24 volt ac. Have you replaced the batteries to see if it fixes all of your issues at once?

Nov 02, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

I recently installed the Honeywell ct87n thermostat.....the AC worked fine all summer, but has been off now for 6 weeks. When I turned in on to heat / automatic...nothing happens...neither the AC or Heat...


Check for a fuse in your AC/Heating system either on the control board or in-line on a wire. Make sure the wires are correct to the thermostat.

Oct 05, 2010 | Heating & Cooling

1 Answer

I have a Honeywell Chronotherm III Thermostat and in instead of showing the temparature in the display it shows -AC. I've replaced the batteries, and tryied adjusting Temp up and down for cooling and...


It would appear to me that you have lost the 24 volt power supply to the thermostat. In referencing the manuals for this thermostat, available @ www.honeywell.com, I've found that when the thermostat is not connected to the wall plate (plate mounted on the wall, that the thermostat either snaps or screws into), it will display the -AC. This being said, either the thermostat is loose on the wall currently, or your 24 volt transformer has died. Hope this helps.

Dec 23, 2009 | Honeywell Power Humidifier: Furnace...

1 Answer

Household Thermostat Replacement


you have to configure the thermostat to run the fan when there is a call for heat. look at the installation instructions and they shoud ask you if it is gas or electric heat if its electric then you are gong to have to configure it to makr e the fan come on with the heat. Good luck

Jan 25, 2009 | Honeywell Electronic Programmable...

1 Answer

Honeywell thermostat for (heat/AC pump) #T874G1246 Temperature levers for heat and cool are only adjustable in tandem, ie: can not adjust them independently.


your heat pump can only do one thing at a time. its either cooling, heating or off. you have no need to adjust set points individually.

Dec 10, 2008 | Heating & Cooling

1 Answer

Honeywell thermostat


make sure not turned on @ tstat to man ,also were you in the heat or cool mode when this occured .

Oct 26, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

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.


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

May 20, 2008 | Honeywell Heating & Cooling

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