Question about Heating & Cooling
Unit cools but has only low speed. when you push button for high fan stops, push low speed, fan starts again. Could it be circuit board or high speed part of motor?
Hi Joe, it could be one or the other, or may be just the switch. About the only way you will know which one it is, is if you have a meter that will read the voltage up to 220 volts if that is what voltage the unit is. I have seen 3 speed motors have one speed fail before, you would have to get the the leads behind the fan knob and with the switch in high position, check for power from the high speed wire to ground to see if you are reading 120 volts. Same on the switch, you would kill power and remove wires from switch. With the meter set on continuity, when its turned to high, your leads should be one on high terminal and the other to ground. You should have a reading depending on the range your meter is set when switch is on high, and nothing when off to ground. This is the only way to know. If the switch checks out, continuity out when its turned to high, or you have power going to the motor lead that's for high to ground, its the motor. If you have no meter, you can pick one up very cheap at a hardware store as low as $10.00 to do this check. You can use it for many other things on your auto and in home also. Try and do these checks, and keep me posted. Please be kind when rating me if I have been of help to you. I will be here if you have more questions.
A/C & Heating Contractor.
PS If no continuity on the switch when turned to high, the switch is faulty. I really don't feel it is a board problem.
Posted on Jul 04, 2010
Testimonial: "Yes good info, Thanks "
It's either the high speed winding on the motor or the button or switch. You need to check to see if you have voltage to the high speed when you push the high speed button. If you have volts it's the motor if not it's the button or switch.
Posted on Jul 04, 2010
Testimonial: "THANKS for the tips. "
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Posted on Jan 02, 2017
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