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Only have high speed on fan - Air Conditioners

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Selector switch! Thank-you-very-much!

Posted on Aug 27, 2008

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Blower just started staying on - furnace has been turned of for 6 months


This is a diagram of a blower relay and a fan motor, the normally closed fan relay switch goes to the low speed which is the Heat speed, the low speed is controllled by a temperature delay depicted in the low speed circuit.
The normally open fan relay switch goes to the high speed, which is the AC modes speed , also if you run the fan continuously via the fan switch on the thermostat this is also to high speed.

I suspect the temperature delay's on setting is being reached thus cycling the low speed of the fan.



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Nov 08, 2015 | Air Conditioners

1 Answer

Fan only runs on high speed


Wild guess the fan was replaced with a one speed motor. Or the selector switch is bad or not connected. Or the relay/s for other speeds are not getting thermostat signal for some reason.

Mar 12, 2015 | Air Conditioners

1 Answer

What do the different fan speeds indicate


The different fan speeds are different airflows across the coil and blows out into the room..
For instance speed
#1 is usually high speed
#2 is medium high
#3 medium low and
#4 low speed

Aug 17, 2009 | Air Conditioners

1 Answer

I can not change the fan speed and also some water leakes out of the air conditioner?


the fan speed is changed by the wiring. The furnace fan in ac is changed by the green wire to high speed as per your attachment on the printed circuit board. the black wire from the motor is high speed and the red is low speed.

Aug 12, 2009 | Amcor A12000E Nanomax Portable Air...

1 Answer

When you switch fan to high speed it trips fuse to unit and main fuse. seems to run ok on low speed but not very cold


You have a short circuit in your high speed and you can either run your unit on low speed all the time or you will need to replace the motor to correct the problem.

Aug 09, 2009 | Air Conditioners

2 Answers

Fan will not run on high. Compressor runs fine but the fan will not run on high. Works fine on low and med.


It's the mode switch contactors for the high setting just overview the wiring of the high cool or high fan contactors if it's not there check all leads for the high fan or high cool circuitry.

Aug 01, 2009 | Coleman Mach III Air Conditioner

1 Answer

I HOPE I AM USING THIS PROPERLY......MY ? IS IN MY


The indoor blower motor is sometimes a 3 speed motor.The heat usually works on low or medium speed.But the a/c is usually on high speed,this gives greater air flow across the evaporator coil to give you better cooling,also better air flow at ducts.These speeds are usually wired through a relay in the inside unit (air handler).They can be changed.If you go to thermostat and put the fan switch to "on" the blower should operate on "high" speed.With the fan switch set to "auto"the operation will determine the fan speed.Hope this helps. Gregg

Jun 04, 2009 | Air Conditioners

1 Answer

No high speed on blower motor


if motor works on heat, but not on cool ,then the low speed is energized by the heat strip or control board .if the motor doesn't run in high on cool, then the fan relay or black high speed tap from the board is not being energized. usually its the fan relay ,which is only a factor in cool in high speed fan mode. try turning fan to on at stat. that energizes fan relay and blower should run in high. gently tap the side of the fan relay and see if fan comes on all of a sudden. if it does the relay is bad. change it wire for wire label all wires and use exact replacement relay unless you know how to read wiring diagram then you can use a 90-340 generic fits all replacement. trace motor power wires back to relay or control board to find where they are fed from.

Dec 07, 2008 | Carrier Air Conditioners

1 Answer

High cool not working


Compressors on these units runs at only one speed. The change to high cool is only a change in blower speed moving air faster over the cooling coil. I would have the running capacitor for the fan motor checked. A bad capacitor can cause your type of problem. The other problem could be that the high speed winding in the fan motor is bad. Try it operation in the fan only position through the two speeds. If it works in the low and high speed for fan only your problem could be in the selector switch.

Jun 23, 2008 | Dometic Rooftop RV Air Conditioner

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