The furnace should be a 3 or 4 speed motor in it. On the circuit board there are places maked heat and cool. If you are looking for low the red wire should be plugged into the heat designation. make sure unit is unplugged before changing
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Black- high speed
Red- low speed
Blue- med. high
Yellow- med. low
Usually black on "cool" terminal on board, red on "heat" terminal on board, and remaining 2 on the "park" terminals on board. White goes to the neutral terminals. Hope this helps!
The only way to really tell if the blower is set to high is to look at the control board inside the furnace and see how it is hooked up. You will have either a 3 speed or 4 speed blower motor, more than likely a 4. These are Hi, Med Hi, Med Low, Low. Each speed has its own color and if the motor has ever been changed, it could be different from factory diagrams. The most common colors/speeds are:
Black- Hi Blue- Med Hi Orange- Med Low Red- Low
You could have different colors but they will be close. If it's an aftermarket motor, the speeds will be listed on the motor itself, but very difficult to get to sometimes. On the board, you should have terminals marked, COOL, HEAT, PARK, PARK. You hook what speed you want for Cool and Heat and put the other 1 or 2 wires on Park.
Again, these might not be exact, but these are the basics and they usually don't deviate from them to much unless it's a 95% furnace or such. If you do have the diagram for the furnace, you will be able to find everything with no problem now that you have the basics. Also keep in mind that you will have a Common wire from the motor that hooks to Com. terminals on the board. Hope this helps and good look!
There should be a wiring diagram on the motor itself. The colors of the wires vary depending on voltage and model. Generally you have a med/low and med/high setting, I'm not sure what you are getting to with the low/high setting unless you are trying to set up staging. Check the motor for a diagram, if that is not present post back with all of the wire colors coming from the motor and the voltage.
You probably cant fix it, this sounds like a multispeed blower with hi/medium/lo settings. You
can either replace the motor or connect one of the
working speeds to low/med or low/hi. or bump med to low and high to medium.
yes in the air handler the blower will have possibly 4 wires the ones you are needing are red blue and black1 will go to a relay or possibly a circuit board and the other 2 will capped off, black is high speed, blue is medium, red is low, most come from factory on med.
Motor speeds on the blower are always remember black is high, blue in med. and red is low sometimes blowers are 4 speeds but the main colors are the black blue and red. Now where to change locate the wires coming from blower to a box or control board. control board has setting for heating and cooling speeds for the blower. You might see blue on heating which would be medium speed so take the red off park terminal and change places with the blue. Now if you have a fan control switch it looks like a dail in the middle of the furnace with numbers on the face with pointers set at the numbers. follow the wires from there to the electrical box and open box. find color of blower and switch be sure to cap off the wire you change. Wire nut would be good.
Yes, look at the control board and follow a larger diameter red wire and see if it goes to the blower. Now follow the orange wire from the blower to the circuit board and swap wire locations with the red one. This will change the blower speed from Low to Medium Low. The Blue wire will give you Medium and may be too fast. The faster the blower goes, the cooler the air feels coming out of the registers. If your ductwork is undersized or your air filter is too restrictive, this will interfere with air flow and not deliver the necessary heat when you need it. Changing the blower speed is only a band-aid to bigger issues. I hope this helps!
On the blower, look for a Blue wire, Red wire and maybe an Orange wire. The Red wire is low spped, Orange is Med-Low and Blue is Medium. Look on the circuit board and see what colors are on "Park" and what color is on "Load" or "Line". Swap that wire to what ever speed you want. Remember that increased speed will make the air from the registers a little cooler.