Heat stays on no matter what the therm temp is set on any ideas
I INSTALLED A NEW THERMASTAT AND THE PROBLEM IS THE SAME . AS SOON AS I TURN THE HEAT SWITCH ON AND GO DOWN TO THE UNITTHF FAN COMES ON AND THE GAS STARTS AND THT UNIT RUN TILL I TURN OFF THE SWITCH ON THE THERM I NEED THE DRAWING 09-24212-01 REV 06
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a heat pump is a finely tuned machine that can be very efficient yet very frustrating at times. I could give you better advice if I were looking at the unit but hear are some things that may help. The unit has a defrost mode that cycles every 30,60,or 90 minutes. If you take the cover off of the condensing unit and near the top you will see the adjustor. unless you live in arctic or very humid cilimates, it should not be set to 30 min. Also the unit may be low on refrigerant. you can check this with a thermometer. put the therm. on the hot gas line(big one) and it should be 110 degrees hotter than the outside temp. Insulate the point of contact around the therm. and gas line. Also, your aux. heat may not be coming on to supplement the heat from the pump. i.e. the fusable link could have burned up and the heating element wouldnt be coming on(elec. models). there are too many variables and combinations of problems that could cause this.
I think that I would change out the thermostat only due to the symptoms you are describing. Think the control board may be fine however, the thermostat sounds as if the internal componants are going out. Good luck on your repairs
Is the thermostat set up for automatic change over from heat to cool? If so, the heat is probably set for 75, you will need to lower the heat setting in order to Lower the cooling. the stat won't let these settings with in 2 degrees of each other so the heating and cooling don't fight each other.
Make sure fan relay is wired correctly (G) wire. Ensure the fan on therm is not on, it should be on Auto or off.
If your furnace is short cycling because it has to keep heating your home, the delay in the control board may be staying on to compensate for the exchangers getting hot. If it heats normally, then put your attention to your thermostat.
Set the heating system on aux heat only. Fan should not be on, if it does stay on after a heating cycle, see if the furnace is heating normally, and reaching temp as desired before the heat comes off. Then check the therm wiring, pull the face of the therm, disconnect green wire (fan) and try the heating again.
Sounds like a stuck relay on the unit itself. Maybe there is a short in the control wire that comes from the thermostat that activates the fan.
The thermostat probably has one hot wire at all times. The thermostat then chooses which wire to send the voltage down based on your selection. One of those wires is probably for the fan only. Make sure that it is in good condition (no bare, pinched or wires)
If the unit has an outdoor thermostat, this turns the aux. heat on very cold days. It may need to be replaced, or removed completely, if its kicking over to soon before it gets that cold. If its set to turn on the electric at 30 degrees, then its working the right way. Also, look for different temp. setting on the board you lust installed, there should be some sort of adjustment options on it. Especially if there is no thermostat outside.