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Thermostat CT1950 my thermostat CT1950 keeps displaying OLOAd

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Re: thermostat CT1950

The manual says this will occur when the connected load exceeds 3800W. It goes on to say that this is a fire hazard.

Posted on Dec 09, 2007

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Display works but no heat

Keep in mind that this unit will take a while to heat up. I have the same unit and it can take up to an hour to get really hot. Once up to temperature, you should hear the thermostat cycle on and off. To test it, set the thermostat to a low setting and leave the unit for an hour. It should be warm. If it is not, then the problem is after the thermostat such as a broken heating element wire. If so, it is probably not worth fixing.

Jan 02, 2014 | Honeywell HZ-709 Oil Filled Radiator...



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 | Heaters


Understanding the display on the programmable Theremostat & the 24 volt control.

Hi, I have seen this over and over, some people asking about the display on there thermostat, and getting a reply that is not at all true. This goes for all Air Conditioning and Heating systems using the programmable thermostat. I would like you to keep this in mind.Every unit has a control transformer that supplies 24 volts to there thermostat. What I am seeing a lot of is, they are told that some units are controlled by the batteries in the thermostat. No, as the unit will not function properly if the batteries are weak or dead yes, but the batteries are used for the digital display that tells the unit when to come on and what comfort zone you want. If you loose the display on a residential A/C or Heater thermostat, change out the batteries to get it back, but keep in mind that you must also have 24 volts from the control transformer for you're system to operate. To sum it all up is, the batteries are for the program only, and do not control you're unit alone. So, if you hear someone tell you that some units run on batteries and some do not, that is false as it requires both a transformer and batteries on the programmable thermostat.Thank you and Sincerely,
PS Once in a while, you will find a programmable stat that has no batteries and will use the 24 volts from transformer only. These stats are normally used on 10 ton to 75 ton commercial units, and require no batteries. For example the Honeywell T7300 stat with a non switching QE-1003 Sub-base for commercial use.If you do have a programmable stat and you are having a problem with it going through batteries very fast, and you have an extra wire in the sheathed cable like a blue one and a C terminal not being used and the same at your furnace where the T-stat wires connect, a C terminal, take and wire that blue wire to both C terminals. This will take care of this problem.

on Dec 11, 2009 | Heaters

1 Answer

My Honeywell Thermostat has an error message OLOad. What does this mean

The manual says this will occur when the connected load exceeds 3800W. It goes on to say that this is a fire hazard.Not sure what could have changed.was(any) work done to the system or house? may be low voltage got crossed with line voltage

Nov 28, 2011 | Honeywell Heaters

1 Answer

Starting this afternoon: Thermastat was set (Manual) to turn on at 68, display window showed 63 but the furnace was not running. I manually set the turn on temp below 63, then up to 67 and the systrm...

Definitely a thermostat.It has 2 sections.One is a temperature reference section(what temp you want).The other is the temp reading section.If either one is bad,it will do just like you said.Sounds like the reference section is probably bad because it comes on for a couple minutes then shuts down.Since it was fine earlier in the day,I doubt there is anything wrong with the furnace because as you can see,it is temperature related.A furnace problem would be more of no operation at all,even if just dirty or whatever.The thermostat also would be a more common 'fail component' than the board.A suggestion also,both for a car and a house.During the summer,run the heat for 2-3 minutes,just to cycle it occasionally.In winter,run the A/C for 2-3 minutes.Do both perhaps once or twice a month.It helps keep the components,somewhat fresh I guess you would say,because cycling it occasionally helps to keep it going good.Also,if you encounter a problem,you may be able to get it fixed before you really need it.In the meantime,feel free to come on down to FL until it's fixed,we have room,lol.Although it's chilly now,the weekend will be 70's.(sorry)Good luck,Greg

Dec 08, 2010 | Coleman Heaters

2 Answers

I'm having a problem with my thermostat. It's a

Set Current Time and Day
1. Press TIME button once. The display will show the hour only.
2. Press and hold either or until you reach the correct
hour and AM/PM designation (AM begins at midnight; PM
begins at noon).
3. Press TIME once. The display window will show the minutes
only. 1F80-361 pdf

Mar 14, 2010 | Heaters

1 Answer

After a power outage my T8011R display will not come on. Breaker is on and the auto fan works--so there is electricity to the thermostat. Is it fried or is there a reset or fuse that I need to address?

Hi, if the stat is working and running the fan, what has happened is the circuitry is faulty that shows the digital display. Before we are certain this has happened, check to see if the stat has batteries in it. Pull the front cover off and check. If it does, replace them and see if the display returns. If it does great! If not its the circuitry in the stat and will need to be replaced. Keep me posted.

Jan 17, 2010 | Honeywell Electronic Programmable...

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