Motor stuck on high, will not cut off or change speeds

Coming into the back of the motor...
4 wires? Right?
Red, Black, White, and Green
A 2 speed will be 4 wires - additional Red wire
A 1 speed will 3 wires - no Red

The black and red wires are your speed wires,
they will go on to your 'line' connections...labeled on the motor next to the spade connection as 'H' and 'L'

the white wire is your common or neutral wire,
it will go on the space connection with a 'C' next to it.

and the green wire naturally is ground. Normally attached directly to the base of the motor.

I cannot tell you specifically which wire is low-speed or which wire is high-speed. Because different spa control manufacturer's alternate or vary the use of colors for low/high speed. Unfortunately it is not standard. But if I was to venture a guess, the majority of these control manufacturers, use red wire for low speed.

I have also seen at times, that the label is Misprinted. Where the common and low-speed are switched?
in my experience, and I have wired and many, many motors. Both two speed and single speed motors. The common is almost always either at the top of the spade connections, or the middle spade connection, I have never seen in my recent experience, where the common connection is at the bottom.
This in common problem, may or may not be the case for you.

to your question specifically:... Both speed wires are not on the same relay, are they? Or is it a contractor?
(normally two different relays on the circuit board for the different speeds of the pump) Unless there is a normally closed and a normally open spade connection?

is this a mechanical spa control system, or is it a digital electronic, with a circuitboard, spa control system?

Hi,

Guess what? A standard dimmer switch will not properly operate a fan motor. In fact, it’s most likely going to damage the fan motor and it could even potentially cause a fire. I’ll admit I even went out and bought a dimmer switch and I sat down to just “make sure” I was doing the right thing when I figured this out.
Standard dimmer switches are designed for the wattage of lights. Fan controls are designed for the amperage of the fan motor. So if you want to control the speed of a ceiling fan make sure you buy a fan speed control that specifically says it works for fans. Fan controls come in quite a few styles. The most common type has been around for quite some time and that is the rotary or dial type. The next most common fan control I found was the toggle that has three pre-set speeds (slow, medium and fast). You can also get a fan control that has a slider control along with a toggle switch.
The type that I want to install is a toggle switch with a small slider switch next to it. I have a feeling I’ll have to order one of these but I’ll check with my electrician tomorrow to find out the scoop. The bottom line is you can’t use a standard dimmer switch to control a ceiling fan. You have to get a fan speed control switch that is specifically designed to operate fan motors.












the short wire leads coming from the switch should be attached to other wires with small wire nuts. Just unscrew the wire nuts, unscrew the finial type cap that holds the switch in place, remove the switch and take it to the store. If your lights are strictly "ON"-"OFF" there should be just two wires from the switch. If your lights are controlled - "One" "TWO" or "THREE" at a time the switch will probably have three wires coming from it.
http://www.ceiling-fans-n-more.com/

Thanks for contacting Fixya.

This is usually due to 1 of 3 possible problems.

1. Bad blower motor resistor - attaches to blower motor and regulates fan speeds. Not uncommon to lose 1 speed at a time until you get stuck with only 1 speed
2. Bad blower motor
   
3. Bad heater control module - less likely but still possible the module is bad and the whole unit requires replacing
   

If the blower motor only works on high mode, then its problem with blower motor resistor. ------------------ The blower motor resistor needs to be replaced.This will make blower motor work on all modes. ----------- Thanks.

blower motor resistor to replace, on the blower motor where the wires connect

Check the heater control switch,,,,,and the number of wires at the heater motor....Some motors have more than one winding...in which case there will be three or more wires going into motor..there can be burnout in those windings and will require a new motor....check the plug which attaches to the motor....can be bad connection...or at the switch.....but if there is only two wires....then the heater switch uses resistors to slow down the different speeds...and direct connection for high speed....and the problem is definitely the switch...

Usually you can find the control board on the lower part of the furnace. Turn the power off and remove the
doors. This board is usually located directly in front of the blower motor.

On the control board locate the terminals marked heat/cool/park and Park Lets say the Heat Terminal
has a red wire attached to it and you want a higher
speed.

Red is uasually low speed, remover the red wire from
heat terminal and exchange it with a wire attached to
a terminal lab eled park. Black is usually high spped

possible ignition switch, also need to check ground wire to terminal G200

It sounds like you are replacing a two speed motor with a single speed. Check the side of the old motor and see if it has high and low speed wiring schematics. If so you need to replace with same model number. Good luck!

check for ground going to fan. If there is no ground replace a/c control panel located under radio it what you use to turn on the heater/ a/c