I changed the battery to the remote and the high speed of the blower stayed the same... I did unplug the low voltage wiring to the board and the fan started blowing in high and after 5 seconds it turned off.. help please!!!
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Re: blower fan will only work in low speed
Sometimes after you replace the batteries in the remote, there is a communication disruption between the remote and the wall hung evaporator. With fresh batteries installed, take a paper clip and press in on the "reset" hole located on the remote. Yes you will have to reset the clock but it may help your situation. Then you will need to turn off both the inside unit as well as the outside unit. You must first turn back on the outside unit then the inside unit.
If it continues as you have described, it could be a relay on the Main PC board and the board will need to be replaced. If all other functions and modes work, you will probably not have to replace the Receiver PC Board.
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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.
If you have a fan that has different speed settings (1234, or low med high etc) and the only one that works is high - then the blower resistor pack has failed. If you have a climate control unit (where you just pick a temp you want) then the fan is controlled by the heating system and it sets fan speed. If you have climate control style try lowering the temp to a lower setting (current temp in vehicle) and see if fan slows down. If not then climate control unit or fan resistor bad. If dial type and you get nothing on lower settings (only high works like mentioned above) you need to change blower resistor. It is located under dash near the fan itself. Look for small unit bolted in duct near fan with wire plug going to it.
If you blower fan will only work on high know that most blower motors are power by a basic electrical circuit that utilizes a multi resistor or a solid-state resistor to control different fan speed modes (low, medium low, medium and high). If the resistor malfunctions it may lose one or more of the lower fan speed settings. First check the fuse and change if needed. If that doesn't fix things change the resister.------------------------------------------------------------------------------------ Launch CResetter Oil Lamp Reset Tool
in order for the remote control to work properly the fan has to be on its highest speed using the pull chain ... after setting the pull chain in the proper position you can tie up the chain or remove it to prevent others from changing the setting .. the remote will control the speed from then on ..
To change blower depends on Make of unit. Most of the time at the fan relay you will Red low Blue med Black high. Only one will be used theother taped off. Just unplug one plug the other one in. Some motros have speed taps on the motor you unplug one wire and plug into the speed you want. Rus