Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner

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Furnace-not heating all rooms to set temperature

My thermostat is set at 70. I check it with a thermometer. It is accurate, I go to my living room and check the temperature. It tells me it is 64 degrees. Can you please help me. I have had the furnace checked several times. The filter is clean and so is the furnace. Please help.

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Re: furnace-not heating all rooms to set temperature

Depending on where your living room is in comparison to your furnace it could be just that the fan doesn’t have enough force to get it there so what is happing is that all the other air is reaching other rooms before it. There are products that can help with this u can find them at larger hardware stores they r inline fans that go in the ductwork or there r a flat type of fan that mounts on the vent and plugs into a wall outlet that will pull the air to that room the latter would be much easier but it is your choice. Hope this helps.

Posted on Nov 08, 2007

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Friend! All thermostat is calibrated to cut in and cut off at the end of - or + 1 degree end.
Example: If you set 23 degree, it will cut off in 21 degree and cut in @25 degree. So accordingly you set the temp.
Secondly, don't set temp near to your room temp.Minimum difference should be 3 degree. If your room temp 12 degree, set at least 15 degree for heat and if room temp 28, set at least 25 degree for cool.
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If i am away for any length of time, do i put the temp on vacation? does the water still get warm?

Since you didn't provide the brand & model of the thermostat, only generic help can be provided.

Most furnaces that run on oil or gas, make hot water all the time, 24 / 7 - winter, summer and everything between so to speak. They are controlled by an aquastat that may be set for any value between 140 - 180 degrees F. This is called "hot start" - simply because when the thermostat is set to a temperature higher than the room (turning heat ON), the water is already hot in the furnace, and is circulated immediately. If it was a "cold start", you'd have to wait for the water in the furnace to heat up from room temperature. This would substantially increase the amount of time it would take to heat the room.

Generally, the "vacation mode" simply halts the program from running. If your thermostat changes temperatures several times during the day / night, it will simply hold the lowest temperature - or a predetermined temperature built in - or chosen by you. You'll need to consult your manual to determine just how your thermostat handles the vacation mode setting. Post again if you can't find the manual - but tell us what brand and model it is.

I hop ethis helps - good luck!

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Thermastat is reading colder than the actual temperature of the room

Your question is phrased a little odd.

1) If when you say 'thermostat' - you are actually talking about a 'temperature reading' on your thermostat - then I would tell you to just get another temp measuring device and double-check the temp.

2) if howerver you are talking about the set-point of your thermostat - for example - you might have it set on 70 degrees and the room temperature is 78 - then I would say that the AC is not big enough to pull the temp down to 70 in the room, or, you have a problem with the AC that does not allow the unit to pull the temp down.

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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.

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Exception 1- (in a heat pump the out door unit runs in both heat and cool mode unless it has emergency heat turned on then it will not come on outside in the heat mode, and depending on the type of heat pump and furnace or air handler it is). A heat pump thermostat usually has "backup heat" and an "emergency heat" setting switch on the thermostat.
Exception 2 - On some thermostats they are made to cycle on the heat if the temperature reaches a preset temp (around 50'f usually but definitely by 40'f). This mode prevents freezing when if instance the homeowner is away or while the home is under construction. In this mode the fan inside can run but the heat usually comes on with it.
Exception3 - On some electric furnaces the heating strips may be individually controlled and thus not all come on at one time. This may give the feel of no heat especially if the room is cold.

Now there may be other exceptions but Ive tried to give you a heads up on some of the most common ones.
If you need more help please post more specifics about your unit/system as to for sure what switches are set to what setting and what is happening with each. My first though was that maybe your system is OK and you needed to know if the thermostat was working properly.

If this helpd you understand your problem would you please give me as hifgh a mark as you can. Thnaks for using fixya and good luck.

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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.

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