Question about Heating & Cooling
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Posted on Jan 02, 2017
if you have a newer t-stat your heat pump reversing valve is either o or b depending on the type of system you have
Posted on Dec 19, 2007
SOURCE: the air handler won't shut off
As long as the t-stat fan switch is in the auto position the problem sounds like fan relay is stuck. It looks like a little black box about 2 inches square. Has 5 positions on it two of them are for 24 volts.
Be sure you turn off power before pulling it out. Make note of the arrangement of the wires maybe label as you remove them. ken
Posted on Dec 27, 2008
most of the time its out by the ac unit . you have a shorting thermostat wire .. the outside unit has a large wire thats 240v and a small one that 24v thats the one you want to look at . look for bare wires , look where it goes into the wall , thats the common place . "critters" love to chew thermostat wire . so take a look . .....please rate this answer , i need votes . thanks
Posted on Jan 24, 2009
The fan is controlled by a blower timer board located inside the air handler, or on older units it has a relay called (of all things) a blower relay. If these items were at fault I doubt removing the thermostat would cause the blower to go off. if bad causing this problem the blower would continue to run even with thermostat removed.
But it is also controlled by the thermostat.
You mentioned that if you remove the thermostat it cuts off. There are 2 switches on most thermostats.
1 has Cool, Off, Heat, and Emergency Heat (on a heat pump stat)
2 The other switch has On and auto (it is for the fan motor only)
I believe because it stops when you remove the thermostat that the switch on the fan is set to on possibly. It should be on auto-matic. This way the fan motor only come on with cooling or heating. If in the on it stays on all the time. If this is the case just switch to AUTO.
Or the thermostat may be wired wrong. The G terminal is where the fan motor gets instructions from the thermostat. Make sure its on G at the stat and the correct wire at the blower coil is being used for the corresponding wire going from the stat to the blower for G. Don't confues G for green it could be any color. The terminals are not for color but it makes more sence to make them color - letter identified. On the other end soemtimes the wires are not colored the same so look carefully.
Also a whisker of a thermostat wire could be touching inside the thermostat and causeing the motor to run 100%. Look carefully at this and see if it has too long of thermostat wires stickinhg on out under the screws to where they may tough other things.
If neither things stop or show the problem and it deffinately stops when thermostat is removed the thermostat is most likely bad.
If this helps you 1 way to make the repairs your\self or helps you realize you need a technician please rate mne as high as you can.
Posted on May 14, 2009
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