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What affect does increasing or decreasing the "span" setting have on the Hunter 40135 thermostat

The temperature setting on the thermostat won't work correctly. The furnace tries to turn on, then just a fast it turns off. It repeats this until I turn up the temp until it's warm in the house, then I have to turn it down again, until it cools again, & it starts the same problem all over. It's a Hunter 40135 thermostat.

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I once had a weird recycling problem with my furnace and I simply cut off the power to it for a few minutes, plugged it back in and the issue was fixed. I know that's not much help but worth a try if you didn't think of it.

Posted on Oct 21, 2013

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6ya6ya
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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

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tborn6
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SOURCE: Furnace doesn't reach desired temperature

On the thermostat if its a manual on then pop the cover off and look for a small dial with numbers on it. Take and move it tpoi a higher number than whats it is set at. Its called a heat anticipater and is supppose to make it so that the unit does not oveshoot or under shoot like what your experiencing. If its a digital oine then you are going to have to configure the setting in the insdtallers menu.

Posted on Dec 21, 2008

motor1258
  • 6674 Answers

SOURCE: Gas Furnace will not start when outside temperature rises to 50F

The anticipator basically prolongs or reduces the time from shut down to start up, so your furnace or air conditioner isn't cycling too much , off and on. It also will anticipate that the setting you have the thermostat set at is near, and will shut thermostat/burner off early, assuming that the temperature will be reached soon, just from heat already in chamber being circulated through system. If it gets too cold before furnace turns on, adjust anticipator, if too hot when it shuts down, go the other way, but whenever you move it, just go a little at a time, until you get it where you want it.

Posted on Mar 13, 2010

Testimonial: "Thanks for the explanation about anticipators. Do they figure much in furnace problems?"

  • 1 Answer

SOURCE: Carrier weathermaker sx 58 furnace

I have serviced these furnaces for 20 years and I can tell you most of these models did not have diagnostic lite on them. (although some did, especially if the control board has been replaced) The problem is most likely a bad 3 wire pilot. This will cause exactly what you describe. 2 things to consider though. 1, If you were to replace the pilot don't get a cheaper knockoff. In my experience these do not last long at all. Get the right one from a carrier dealer. It will cost more but be much more reliable. 2 What is the condition of the secondary heat exchanger? Most if not all of the sx series had issues with the secondary heat exchangers rotting out and leaking. If the furnace is out of warranty you would be much better replacing the furnace as the cost of replacing the secondary heat exchanger will probably be almost the same as a new furnace. ( those babies are EXPENSIVE!)

Posted on May 01, 2010

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Read more :http://www.ehow.com/info_12203962_check-dryer-thermistor.html

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In some dryer's the control panel relies on a thermistor rather than a CYCLING thermostat to regulate the drum's air temperature by monitoring the component's resistance changes; resistance goes down as temperature increases and up when temperature decreases. Once the drum's air temperature reaches a certain level required to dry clothes, the control panel shuts off the heater. The panel will turn the heater on again and begin another heating cycle when the thermistor indicates that more heat is needed to keep the air temperature constant inside the drum

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In some dryer's the control panel relies on a thermistor rather than a CYCLING thermostat to regulate the drum's air temperature by monitoring the component's resistance changes; resistance goes down as temperature increases and up when temperature decreases. Once the drum's air temperature reaches a certain level required to dry clothes, the control panel shuts off the heater. The panel will turn the heater on again and begin another heating cycle when the thermistor indicates that more heat is needed to keep the air temperature constant inside the drum

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Temperature setting is wrong. Stove is about 80 deggrees cooler than what the knob is set at. I am a yooper too.


If you think it is too cool, adjust the thermostat to make it hotter.


To Adjust the Thermostat:
1. Put the Oven Set knob in the OFF position.
2. Press and hold the HOUR INCREASE and the HOUR DECREASE pads at the same time for 5 seconds until the display changes.
3. Immediately, before display changes back, press the HOUR INCREASE or DECREASE pads to increase or decrease the temperature in 5 degree increments.The oven temperature can be increased up to 35°F.hotter or decreased 35°F. cooler.

If the oven adjustment is set cooler than the factory setting a minus sign “–” and the new temperature will appear in the display.

4. Wait several seconds for the control to automatically set and return to its previous setting.

NOTE: This adjustment will not affect the broiling or the self-cleaning temperatures. The adjustment will be retained in memory after a power failure.


To Adjust the Temperature on Models with Only an Oven Set Knob
1. Put the knob in the OFF position.
2. Pull the knob off by pulling straight out.
3. Press and hold the HOTTER or COOLER button for 5 seconds to make the oven 20°F. hotter or 20°F. cooler.
When you are adjusting the thermostat, the following lights will flash indicating where the thermostat will be set when you release the
adjustment button:
OVEN ON indicates the thermostat will be set at the factory setting.
PREHEATED indicates the thermostat will be set 20°F. hotter.
CLEAN indicates the thermostat will be set 20°F. cooler.
4. After you have made the adjustment, replace the knob.



If you have any doubt please go through the manual which is given here

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Hope this will help you
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1 Answer

Thermostat takes too long to cool down 1 degree


Thermostats don't cool or heat. They are just the control device that tells the furnance or AC to operate and register the present temperature and tell the furnance or A/C to shut off, once the desired temperature has been reached.

Most programmable thermostats will take at least 1-2 weeks to "learn" how long to run the furnance or A/C in order to reach the desired temperatures you've programmed into it, for the time you want it be that temperature. Variables such as extremely hot days and higher humidity will also affect your cooling system.

Give it a little time to self-learn and it should adjust itself after a week or two of operation. You might want to take some time to review and familiarize yourself with the owners manual to see what Hunter advises for setting up and using the thermostat.

You may need to have your A/C checked to see if you're running low on freon, or need to have the coils cleaned, need to change the air filter, etc.

Hope this helps and best regards!

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Programmable Thermostat Model 43157


On my Hunter model, there is a "Span" setting that allows you to change how long the AC/Heat will run before it turns off. Basically, it sets the acceptable range (above and below) your temperature setting. To access this press both the up and down arrows and hold them. "Span" should show up with a number (1,2, or 3). For your problem, change the setting to 1 so the AC will run shorter, and more frequently to keep the temperature more constant.

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