Furnace-not heating all rooms to set temperature

Hi,

please check the vents in the rooms that are not cooling well. There might be a hole/leak in your heating system. The thermostat itself might not be the problem. If possible, please research google nest to check if it has multiple thermostats that can be used to more accurately state the average temperature across several rooms of your home.

You might need to get an hvac diagnostic to find and plug all of the leaks in your home before deciding to alter any of your heating system.

Thank you.

The Honeywell RTH2300 doesn't need a C-wire. See the documentation in the Installation & Setup section on the support page: https://www.honeywellhome.com/us/en/support/air/thermostats/programmable-thermostats/5-2-day-programmable-thermostat-w-change-reminder-rth2300b1038-e1/ . If your old thermostat had a C-wire, check the system board at the furnace. Make sure that the G-wire (usually green) at the thermostat is also connected to the system board's G-wire connection.

First check the obvious: what is the current position of the fan switch? It should be on auto. (That's the switch on the right.)

Is the temperature that the thermostat is reading match the real temperature in the room? Check with a thermometer. If the area near the thermostat is still above (cooling) or below (heating) the set temperature, the room circulation could be a factor. I know my home's thermostat keeps the A/C running for a while after a thermometer on the other side of the living room reaches the desired temperature in the evening when parts of the house are closed off.

If the thermostat temperature reading is correct, the signal may not be reaching the system board. You can check that all of the individual wires between the thermostat and the system control board are undamaged. I've seen those thin wires break when you take them off one thermostat and connect them to another.

Another possibility is that a relay isn't working. Contact Honeywell if the temperature sensor isn't giving the correct reading. Contact a heating and cooling repair person if the problem is with a relay or the system board.

I hope this helps.

Cindy Wells

Yes there is a one degree tolerance, in fact my heater just kicked on and it is set to 67 and the inside temperature reads 67. It is also a Honeywell.

Does the furnace stays off?.
Furnace are ment to cycle on and off because of limits .If you set to 70 furnace would cycle several times before reaching that temperature.
Just make sure your filters are clean and you got proper return air flow because lack of air flow will cause furnace to shut off sooner than normal

Sounds like the switch that controls the blower is faulty. It should heat up then come on at preset temp. As for the stat where is it located. It should be located 60" off the ground not in any direct sunlight and make sure it is insulated behind the stat. You could have more heat loss in those rooms too. IE poorly insulated windows air penetrating through outlets do those walls face the wind? Is the stat located next to a heat supply?

There is probably another thermostat buried in the furnace for safety purposes which could be faulty - it is very unlikely there won't be safety devices built into the furnace and no reason to assume those devices would be any more reliable than a room thermostat for instance.

You really need a service manual for your furnace.

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.

Charlie

When the thermostat calls for heat it should run until the room reaches the temperature setting then shut off. Is the blower motor running and can you feel air coming out of the vents? It sounds like the blower is either not running or putting out enough air to keep the furnace heating. The blower moves the heat from the heat exchanger to the room, if it can't remove enough heat from the heat exchanger there is a limit switch that will shut the burner off if it gets to hot and that's what it sounds like is happening.

Augold, sometimes its best to set the thermostat where you "feel comfortable" . I.E. set it and leave it til you feel the need to be cooler or warmer.

A thermometer on a thermostat will not always be accurate and setting it will only get it within 2 to 5 degrees which is enough to "feel".

Now from the stand point of is it working properly????

Assume you feel comfortable and the heat stays on to keep you comfortable is their anything wrong with this? I assume this is the goal. Even if it says 90 (and you know its not 90) and your comfortable you could leave it alone and be OK. If this kind of thing is whats bothering you a new thermostat may not be much better, unless your ready to invest in one and accept it however it should be closer to the place youd set it. Id recommend an electronic type they are more accurate and level doesn't matter so much to these types.

If you want to set the temperature and are determined to go by a thermometer to "feel Comfortable" I recommend you buy an electronic thermometer and set it close by the thermostat. Make sure you have no lamps or other heat sources close to the thermostat area.
Remember the far end of a room or a chair by a window Especially with little or no curtains and on the prevailing out door wind will always feel colder and be colder than the area by the thermostat even if both are in the same room. If your too cold try running the thermostat up a few degrees. If too warm set it lower. The equipment doesn't care how cold or warm it is.You will not increase your utility bills to the national debt by being comfortable

If this helps please grade me accordingly and Good Luck.