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My chronotherm thermostat pannel wont work , although the pannel displays time and temperature I cannot alter any settings or program it - the touch buttons do not seem to accept anything. It is a honeywell cm51. I have replaced the batteries.

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  • adam_m_p_smi Oct 20, 2008

    I have exactly the same problem. Let me know if you find a fix!

  • losiakowa May 17, 2009

    I have this same problem. My thermostat, doesn't working. When i'm pressin the buttons it's ok, but later its again gone bad. Who can help me? 

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1 Answer

Push on the little reset button on the back (print) side

Posted on Nov 04, 2008

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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 | Heating & Cooling

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Hunter 44860 touch screen temperature override


"Hunter" says it all. Throw it out and buy a honeywell, robertshaw, or a white-rodgers. Hunter stats are notorious in the business as being problematic.

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Chronotherm Three thermostat vs Buderus Logamatic Computer.


The outdoor thermostat senses the the temp of the outside air, and adjust the boiler water temp according to what it knows is best. The reason that the boiler is running longer is the old boiler used to be constantly sending 180ish degree water to the baseboard, now that water may only be 140ish degrees. The idea behind this is to reduce off cycle heat loss, as the greater the temp difference between the air temp and water temp, the quicker you loss heat. The theory in boiler run time is this, the less times it starts and stops, and the long run times will give you the best efficiency. Hope this answers you questions.

Sep 28, 2009 | Honeywell Power Humidifier: Furnace...

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Cooling temperature will not below 70


controllers more than likely on a memory lockout... kill the power and take the batteries out of it... leave it for 60 seconds and try again... unfortunately you are probably going to have to replace the controller, sorry

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-AC appears in the display of chronotherm III


I have had the same problem- twice. It was a similar but different problem each time. The -AC means the ac control voltage isnt making it to the thermostat. In my case both times it was a switch in the control circuit that wasn't closing properly. The easiest was the front cover switch. If the front cover is removed from the furnace or has vibrated loose, the switch will open, preventing the furnace from running. The other instance I ran into was a flow switch on the exhaust blower which ensures the there is flow OUT the chimney. The switch wasn't functioning, so the furnace wouldn't start. The blower would come on for a short time, but the burners wouldn't light.

Hope this helps,

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Fan Honeywell Chronotherm IV T8600


sounds like the fan has been programmed to come on during that time. run through your programming settings and make sure the fan is set to auto for all the times.

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Honeywell cm61 controller


Turn off ‘Optimum Start’
Step 1 Put the thermostat in the OFF position.

Step 2 Press 3 buttons together (at the same time) which are the INFORMATION BUTTON (i) and PROGRAM BUTTONS 3 & 4.
This will show a code of ICL 1 – now let go of the buttons.

Step 3 Press PROGRAM BUTTON 2.
This will now show a code of 30t 1

Step 4 Press the + BUTTON (on the left of the display), tap through until you reach 15 OP 1

Step 5 With the TEMPERATURE DOWN BUTTON; change the 01 to a FLASHING 0. Confirm the FLASHING 0 with the INFORMATION BUTTON ( i ). The 0 will now be static.

Step 6 Put the Thermostat back in the ‘AUTO’ position.
‘OPTIMUM START’ is now switched off.

Dec 23, 2007 | Honeywell Programmable Thermostat Heater

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