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Fan only operates now on lowest speed in spite of pulling switch to vary speeds

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Check contact of switch. if okay then the motor winding is defective

Posted on Oct 02, 2009

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Posted on Jan 02, 2017

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1 Answer

Engine cold. Start engine reading says engine hot ac off. Fans run all time.


Are the fans running on low or high ?
Circuit/System Description
The engine control module (ECM) commands the fans ON in either high speed or low speed, depending on cooling requirements. In low speed, both fans are turned ON at a reduced speed. High speed has both fans turned ON at full speed.
In low speed operation, the ECM applies ground to the coil side of the fan low relay. This energizes the coil and applies voltage directly to the left cooling fan through the switch side of the fan low relay, which is fed by the fan 1 fuse. The right fan is connected in series to the left fan through the de-energized fan control relay so that both operate at low speed.
In high speed operation, the ECM applies a ground to the coil side of the fan low relay, the fan control relay , and the fan high relay. On the fan high relay, the energized coil closes the switch side of the relay and applies voltage directly to the right cooling fan through the switch side of the relay, which is fed by the fan 2 fuse. At the same time, the ECM energizes fan control relay pulling the switch side over, providing a direct path to ground for the left cooling fan, which has voltage applied through the energized fan low relay. In high speed mode, the fans are operated as a parallel circuit with full voltage applied to each.
You should have it hooked up to a scan tool that can read engine sensor data parameters . Check for DTC'S - diagnostic trouble codes etc...
Circuit/System Verification
  1. If DTCs P0480 or P0481 are set, perform those diagnostics first.
  2. Ignition ON, verify with a scan tool that the control module is not commanding fan activation.
  3. Ignition ON, observe that the fans are not activated.
Your best bet is to take it to a ASE certified repair shop !

Jan 10, 2016 | 2009 Chevrolet Silverado 1500

1 Answer

Medium Fan Speed not working


Switch is probably faulty, or wire / connection to switch. If switch and wiring test ok trace wire from that button back to wherever it goes and look there for fault.

May 12, 2014 | Faber TEND30SS300 Decorative Collection...

1 Answer

I have a harbor breeze cieling fan with a 3 speed pull switch. It has 4 wires black /gray /brown and purple. The switch has L/1/2/3. I need to know which wire goes in which position ?


Old switch and new switch have to be compared using multi-meter or continuity tester.
Each 3-speed switch has identical pull-chain sequence: off-high-medium-low.
Each 3-speed switch has only one wire that connects to Hot wire.
But the other three wires can vary.
For example connect power to switch Hot wire. Let's say switch is in off position. Pull chain once for high speed and power might flow to just one wire, or it might flow to two wires, depending on the switch.
Pull chain again for medium speed, and power might flow to just one wire, or it might flow to two different wires.
Pull chain again for low speed, and power usually flows to just one wire.

Easiest place to start is to find which wire is Hot.
Only one wire connects to Hot power.
That same wire on the new 3-speed switch will connect to all other wires. When testing, only one wire connects to all other wires.
Once hot wire is determined.
Then test which sequence of wires receives power each time chain is pulled.
Repeat same test on old switch.
Note how old switch was connected. And then map the change-over to new switch.

Open following link for resources:
http://waterheatertimer.org/How-to-wire-Cooper-277-pilot-light-switch.html#3-speed

Sep 01, 2011 | Electrical Supplies

3 Answers

Replacing a pull switch on an Encon fan. 4 wires. Didn't label wires before I pulled them out. Number on old switch is 1282M and 17292101 with A B C D labels. Can you tell me which wires go where? ...


I have just figured out the wiring to my Encon 5TD42WHC ceiling fan. (This is not to say your fan won't be different.) You can't use just any switch; the switches vary in operation. See the images attached. Good luck, and be careful working with AC voltages.
replacing-pull-switch-encon-fan-4-aseefv3yenzwb0ll4vjok1dd-3-2.png

Dec 23, 2010 | Encon Industries (78018) Ceiling Fan

1 Answer

Variable speed fans suddenly slow single speed only.


check with the temperature of the CPU core!
because of over heating the CPU is shutting down or not.

Sep 24, 2009 | IBM Computers & Internet

2 Answers

2002 Honda Odyssey fan only works at high speed. The A/C compress


Usually when the blower fan only operates on hi speed, its because of a failed blower motor resistor. You still have hi speed because on hi, the power going to the blower motor goes directly to it, as opposed to the lower speeds, when the power is routed through the resistor, thus lowering the voltage, which in turn lowers the speed of the fan. The resistor is usually located near the blower motor itself, under the hood back near the firewall.

Aug 15, 2009 | 2002 Honda Odyssey

3 Answers

AIR CONDITION


replace switch, works 9 times out of 9.

Nov 08, 2008 | 1998 Nissan Frontier

1 Answer

Casablanca fan speed problem


If this fan has a pullchain that also controls the fan speed, and you have a remote, the pullchain has to be set for the highest speed. If it is set at medium or low, it will mess with the remote operation. Note: usually high speed is the first pull after the "off" position.

Oct 27, 2008 | Casablanca Fan Bel Air 3811T Ceiling

1 Answer

Trying to replace 3 speed ceiling fan switch


Hello,

The black goes to the L connection the others are a guess. You can do this two ways. Connect the colored wires in any sequence and then see what switch sequence give you high and lowest, the other one will be medium. Once you determine that, mark the wires with a piece of masking tape as high, medium and low. Otherwise you connect them, turn power on and use a multimeter to see which color gives you the highest voltage and which gives you lowest. Since you aren't comfortable using live wires and a meter, go with the first option and use the process of elimination to find the wires giving you the speeds you need to find the highest and lowest. Next, you need to determine how your switch sequence works. First pull has to give you highest speed. so you may end up wiring them in reverse if your first attempt is backwards. There is a reason the first pull needs to be highest, it powers up the motor so you can then chose a lower setting. A low setting first will over tax your motor and wear it out eventually as it has to work harder at first.

Let me know if you need further clarification and perhaps this is all you need to get fixed.

Regards,
Worldvet
ps I checked on the Internet of a wiring diagram and I bet you did tok all to no avail.

May 26, 2008 | Westwind Classic Hugger Polished Brass 52"...

1 Answer

Fan speed too fast


Is there a light switch control or just straight power to the fan? They do sell "Fan" controll switches just like a regular dimmer, but for a fan. If there is just straight power u would still be able to install a remote that could lessen the speed. Even if it is just pull chains. the remote would have three speeds and if u kept the pull chain on low, maybe the low remote speed could work.

May 22, 2008 | Hampton Bay 54 In. 5-Blade Fan, Chestnut,...

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