Question about Honeywell Programmable Thermostat Heater

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Inside tem. can not reach the set tem. during the cool days

TEMP SET 26C' ONLY RISES TO 18.5C'/ .. BURNERS FIRES GOOD FULL FLAME BUT SHUT OFF ,BACK TO PILOT STAGE JUST AFTER 2 MINUTES ..THEN COMES ON AGAIN IN ABOUT 3-5 MIN...EQUIPPED W/ TWO STAGE FAN ...WHICH BLOWS LOW CONSTANTLY, HOWEVER IT DOES BLOW HIGH COOL AIR FOR A COUPLES MIN. AND THEN .. FULL FLAME AGAIN ......

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  • wojow52 Feb 27, 2009

    what's "pressure switch"?...is it on the heather or the thermostat?...I have the same problem, should I go and get new programmable thermostat?

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  • Honeywell Master
  • 1,898 Answers

Check the presure switch jump it out and see if it fires all the time

Posted on Jan 17, 2009

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What should I do?


have you checked make sure the fan is in AUTO it is very easy for someone put it in manual.

Jul 30, 2014 | Thermostats

1 Answer

My White-Rodgers Model #1F78 5/2 Day Prgm thermostat turns on and ighnites for a few seconds then turns off even after reprogramming or resetting. What should I do next to get the heater to start working?...


If the furnace or boiler burners actually light for just a few seconds and then go out, the problem is probably NOT the thermostat. Most likely the thermostat is calling for heat so the burners light, but there is a safety device called a flame sensor that will shut off the burners if it does not sense the flame properly. It is very common for the flame sensor to get soot, dirt, or oxidation on it and then it can not sense the flame and the furnace does exactly what yours is doing. Most of the time the flame sensor can be cleaned and it will work again. Sometimes a new one will take longer to go bad again. Typically they are a straight or "L" shaped piece of wire about the size of coat hanger wire that just sticks into the flame. The coat hanger type wire usually goes into a white ceramic base which in turn has a wire connected to the back end. Steel wool works good to clean the flame sensor, but if you use coarse wool or coarse sand paper the surface of the flame sensor gets rough and gets dirty faster. It is made of some kind of "polished" stainless steel.

Dec 10, 2013 | WHITE-RODGERS DIV 1F78-151 White 70 Series...

1 Answer

Trying to set thermal stat to cool


Look at the bottom of the T'stat or in the newer ones click menu and follow instructions to preset individual days or on some week and weekend if there is a switch at the bottom set it on the cool selection click the menu button if it has a next buttton then click it until it gets to the degrees and push the <or> button until you get to the temp you want it to be at and then click next until you have all the days programed to the temp you want it to stay at and when your finished push the done button if it has one and it should be programed for the cool side to set the heat set it to heat and do the same as you did on the cool part remember down for cool and up for heat on the degrees you set them on example if you set it 78 for the temp on cool and during the day you want it cooler set it to lower temp say76. if you set it 79 then it won't come back on until the temp is 79. Maybe this will help some programable t'stat are a little more complicated then this

Aug 17, 2012 | Honeywell Programmable Thermostat Heater

1 Answer

The thermastat will not stay as programmened? It blows cool air for long periods. I set it and seems like all is working then the next thing I know its off doing its own thing frustrating??? Please Help...


so its obviously an air con? are you running in automatic mode, if so that can be a problem as automatic yes is a good idea to maintain a set temp but it goes from heating to cooling so you heat an area and t/stat says its too warm turns heating off then goes over set temp so its starts cooling usually that is to do with the location of t/stat and set out of heater but automatic is useless and really is only good for offices where its not noticed like your own home, i tell people not to use automatic but set the control to what you want so if its cold you heat if its hot you cool you don't need both tassie where i'm from has four seasons in one day but i still don't think you need to heat and cool in one day the only place in the world that has such major condition changes is the sahara desert where it'l cook you during the day and freeze you of a night so if my assumptions right and you are using auto function DON'T. use what you need to either cool or heat your house not both in the same day it doesn't make sense and yes you can run it all year long on auto but its really not worth paying to run something you don't really need!

Nov 18, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Ac unit continues to run for as long as up to 45 minutes after it reaches set point. why? thermostat functions properly periodicaly. thermostat is about 15 months old. was installed at same as new heat...


this can be caused by several issues (1) Configuration program, this is not the program that you the end user set up for time of day programing. Nor set point. but how the T-stat is set up to operate for your particular system, A dead band change my be necessary.in most programable T-stats the system must get temp 1 degree below set point before the system will shut down (2) A relay can be sticking in the condenser unit keeping the compressor on when there is not a call for cooling. for this a good working knoledge of electricity is a must although the t-stat opeates on 24 volts there is high voltage in close proxcimity of control relays ranging from 120 too 240 volts (3) dust on the temp sensor can also be an issue dust act as an insulator not allowing the sensor too sense the Temp properly. (4) or that T-stat can and possibly has failed Electronic T-stat are suseptable too power surges although this is not a frequent occurance it is possible. I would reccomend having your local HVAC contractor check into this. depending on you Mechanical skill

Sep 16, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Furnace cuts off before reaching set temp.


You can make sure it is not the thermostat by crossing or jumping the R and W terminals (or associated wires) together. This will keep the furnace calling for heat. As it is approaching set temperature, get in front of the furnace and inspect the air filter to make sure it is clean, watch the control module for any error codes that may be turning off the system prematurely.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Mar 07, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Ac set at 74 room temp up to 78 and no Ac kicking on.


it could be the thermostat is loose on the subbase or if you went from OFF to COOL and the stat is a digital stat It will not come on for five min. This is a delay set by the manufacture to protect the compressor. during normal operation you will not notice because thier will be more than 5 min from the time it shuts of till it need to come back on but if the system switch is set to off and you switch to cool or unit just shut off it will always delay 5min. usualy there will be some insdiction on the screen that it is in delay like a flashing COOL or SNOW FLAKE or the word WAIT. the unit will not be running until the flashing words go solid

Jun 26, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Indoor temp doesnt go to my punched in setting of 68 on therm


if it is around 93-97 degrees outside,thats all the cool your going to get

Jun 23, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

My thermostat will not change the temp when trying to change


tHE TIME PERIOD SETTINGS ARE ONLY TEMPORARILY OVER RIDDEN. oNCE THE TEMP YOU SET IS REACHED AND THE UNIT SHUTS OFF IT DEFAULTS TO THE PERMANENT SETTINGS ON THE CLOCK.

Jun 05, 2009 | Honeywell Programmable Thermostat Heater

2 Answers

FURNACE CYCLING ON AND OFF ..


I would check furnace filter first. If that looks good i would check the thermostat. To check thermostat turn power off to furnace then take thermostat off the wall and connect wires labbled R & W together then turn power on and check furnace to see if it runs for more than a couple of minutes. If so install a new thermostat. If that doesn't work let me know and i can give you a couple more thing to try.

Jan 17, 2009 | Honeywell Programmable Thermostat Heater

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