Question about Heating & Cooling
High temperature swing between off & on eg rtc set @ 18c room 15c no heating unless turned up
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Posted on Jan 02, 2017
Turn up your outside thermostat in the outside unit.
You should have about 3 degrees difference in one stage to the next. So I would change the thermosat with one that has three stages of heat.
Posted on Nov 30, 2008
SOURCE: Honeywell Thermostat RTH7400D
The thermostat will not cut off the A/C until the thermometer reading gets to 76.
If there is not a heat source near/behind the thermostat which is causing the thermometer to read higher than actual room temperature, it sounds like the thermostat thermometer is out of calibration.
There are ways to calibrate it, but much to involved to go into here.
One solution is to just set the thermostat at 80, knowing that it's really set on 76.
Another solution is to replace the thermostat.
Posted on Aug 14, 2009
Hi, Just to let you know I have repaired central Heat & Air systems for 33 years and Have seen this problem on many occasions. Lets see if I can save you so many trips.It says you have a programmable stat? On this stat and on a mechanical stat, they have what is called a heat anticipator that controls how many and how often your thermostat turns you're unit off and on and how long it cycles after the stat is satisfied. If you have ever seen under the cover of a mechanical stat, ( mercury switch type) you will see a dial with an arrow with numbers as .1, .3, .4 1.0, or .15 to 1.0 amps.Some are fixed and some are adjustable. On a digital stat, you will have to get into the program and see what the heat anticipator is set on. They come from the factory at .4, but to really find out what you'res should be it takes an amprobe to do this. The setting you need is what you're gas valve requires.I am sure I have lost you, but I am just giving you a little food for thought. If you can get into you're program and set this to .4, great. If the problem continues, your anticipator on this stat is more than likely, shorted, which would require you to buy a new stat.With a shorted anticipator, it will seem to be working like you say, but when satisfied, the temp.keeps falling until you reset power, then it fires and repeats this. Change the stat. If this is central heat and air, just follow red-rc which will have a red jumper to rh for heat, white to w, green to g=fan, and yellow or blue to y = cooling. If you have central heat only, you will find 2 wires red and white.Red to rh with jumper still installed to rc and then white to w.This is quite a long explanation, but I wanted you to know a little more then the next guy about your stat. Please let me know.
Posted on Nov 12, 2009
R comonY cool W heat G fan C other side of 24 unless you are battery operated. On the back of the Tstat tou should have switch that says gas or electric this controls how the fan operates. If not go into programing and program 1 stage heat one stage cool.Let me know I will walk you thru this.
Posted on Nov 18, 2009
If the thermostat is not over shooting the temperature than don't worry about it.
These thermostats are very sensitive and will turn the heat back on even before the degrees drop on the display. Often they will shut down before the display changes also. You can change the sensitivity of the thermpstat if you read the directions and change the cycles per hour to a less number. There is an installers program in there that you need to push a combiunation of buttons to get too. The instructions tell you how to do that also.
Hopefully you did not throw away the instruction manual for your t-stat.. :-)
Posted on Dec 28, 2009
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