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Re: Heat comes on when the temperature setting calls for...
Getting heat in the cooling mode leans toward the reversing valve in the outside unit. it changes the flow of refergerint so that the hot air you get outside in the summer is blown inside in the winter. another possibility is that the reversing valve isn't getting 24v check to see if you have 24v at O and C either at the t-stat, furnace, or the outside unit. if you check at the furnace rember the safty switch for the lower door if that switch is open you will have no power. i would look at the t stat first if you have 24v there go to the outside . 24v present outside will mean a bad valve or board, no 24v means a bad or broken conection in the control wire between the stat and the outside unit(usally the orange wire)
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Last month, I had this exact same issue where my temperature was not matching the set point on my heating system. I called an HVAC specialist and had it looked at. The issue turned out to be due to the fact that I always kept the heater on, instead of just on auto. These types of malfunctions seem to happen when people continually blast their heat or AC. Kelowna Heating Air Conditioning Services
Often after a repair has been made, the air conditioner will take hours to readjust back to normal. When the system has been off for to long, not only does the heat in the house rise, but so does the humidity, which has to be pulled out of the air first before it really starts dropping in temp. You could have a low charge on refrigerant, dirty filters, etc. More than once I have ran into things that were just coincidence after a repair that showed up. Since you just replaced the capacitor, I would make sure the fan motor is turning in the right direction and there is nice air flow coming out of the condenser, some times if one wire is wrong, it can cause it to spin backwards, which will work, but just barely. The air needs to be pulled through the coils, not pushed. Hope this helps!
Mystery message "wait" appears above "following schedule" display line on our Th8000. Ac does not come on even when temperature is in range. Fan operates ok. Is "wait" setting one I can reset? Maybe a compressor issue rather than thermostat? Thanks
hi how are you...you say your outdoor unit is not working...is thermostst set in heat or cool when this is happening....if the compressor is running,go outside put your hand on the big copper line,if it is hot,your in heat mode,if it is cold your in cool mode..is it heatpump or ac only...if ac only ,you have a sequencer stuck ,or contactor closed keeping heat on...please chek items first...michael doctor airr appl.repair 843-384-8474...if need help call,ill help talk you diagnosis of problem...
The stat that works is called the main and the other two are called slave stats. The stats must be set to heat or cool the same as the main. If you want one room to cool and one to heat , sorry. Need to upgrade to auto changeover. Is this AC actally a Heat pump?
If you have a standard thermostat the fan switch is for the air handler only. It completely over rides the thermostat for most settings. Now lets see this is what I'd expect: fan switch on Indoor fan runs all time Fan switch auto Indoor fan only runs when thermostat is set to cool or heat and the thermostat is turned up above room temp for heat or below room temp for cooling. In both of these modes the furnace blower comes on and stays on til the room temperature is satisfied. The outdoor unit only comes on for AC the out door unit will not come on for heat or the "on" setting on the thermostat. See exception 1 & 2 below...
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.
I hate to say it but Ive had trouble with Carrier's Tstats doing similar improper things. Unfortunatly the only repair is going to be replacement of the whole tstat. I recommend Honeywell's FocusPRO or VisionPRO tstat. Ive yet to have one fail and they have a 5yr warranty if they ever do.